Commitments and Contingencies (Detail) $ in Millions	Feb. 28, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 155

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant