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Commitments and Contingencies (Details Textual) (USD $)
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3 Months Ended | 6 Months Ended | ||||||
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Nov. 30, 2013
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May 31, 2013
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Nov. 30, 2013
Line of Credit [Member]
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Nov. 30, 2013
Revolving Credit Facility [Member]
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Aug. 31, 2013
Revolving Credit Facility [Member]
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Nov. 30, 2013
Revolving Credit Facility [Member]
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Nov. 30, 2013
Standby Letters of Credit [Member]
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May 31, 2013
Standby Letters of Credit [Member]
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| Line of Credit Facility [Line Items] | ||||||||
| Maximum amount outstanding during period | $ 175,000,000 | $ 25,000,000 | ||||||
| Interest rate on amount borrowed | 3.25% | 3.25% | ||||||
| Maximum borrowing capacity | 500,000,000 | 500,000,000 | ||||||
| Expiration date | Jun. 21, 2018 | |||||||
| Amount outstanding | 0 | 0 | 0 | |||||
| Amount available | 35,500,000 | 36,800,000 | ||||||
| Expiration date range of letters of credit | July 2014 and December 2014 | |||||||
| Irrevocable stand by letters of credit amount outstanding | 0 | |||||||
| Commitments and Contingencies (Textual) | ||||||||
| Commitments to purchase capital assets | $ 6,400,000 | $ 9,900,000 | ||||||
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Expiry date range of letters of credit. No definition available.
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| X | ||||||||||
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- Definition
Irrevocable standby letters of credit amount available. No definition available.
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| X | ||||||||||
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- Definition
Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. No definition available.
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| X | ||||||||||
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- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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| X | ||||||||||
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- Definition
Amount borrowed under the credit facility as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Date the credit facility terminates, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Maximum amount borrowed under the credit facility at any time during the period. No definition available.
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| X | ||||||||||
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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