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Contingencies and Other Accrued Losses - Additional Information (Detail) $ in Millions | 3 Months Ended
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Nov. 30, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract] |
Litigation settlement amount | $ 6.5

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

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration