Fair Value Measurements (Narrative) (Details) $ in Millions  | 
 May 31, 2018  
USD ($) 
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| Fair Value Measurements [Abstract] | |
| Long-term borrowings outstanding | $ 0.0 | 
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- References No definition available. 
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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