Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013
Equity [Abstract]
Pension adjustment reflecting actuarial gains	$ 43,106

After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

No definition available.

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