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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | Nov. 30, 2017 | May 31, 2017
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Commitments to purchase capital assets | $ 4.5 | $ 7.4

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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