Commitments and Contingencies Commitments and Contingencies (Details 1) - Revolving Credit Facility [Member] - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Nov. 30, 2015 |
Nov. 30, 2014 |
Nov. 30, 2015 |
Nov. 30, 2014 |
|
| Line of Credit Facility [Line Items] | ||||
| Maximum amount outstanding | $ 350.0 | $ 150.0 | $ 350.0 | $ 150.0 |
| Average Amount Borrowed | $ 225.0 | $ 150.0 | $ 217.0 | $ 125.0 |
| Weighted-average interest rate | 3.25% | 3.25% | 3.25% | 3.25% |
| X | ||||||||||
- Definition Average amount borrowed under the credit facility during the period. No definition available.
|
| X | ||||||||||
- Definition The effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Maximum amount borrowed under the credit facility at any time during the period. No definition available.
|
| X | ||||||||||
- Details
|