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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | Feb. 28, 2017 | May 31, 2016
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Commitments and Contingencies [Abstract] |  |
Commitments to purchase capital assets | $ 6.7 | $ 6.8

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant