Assets or Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified	May 31, 2013		Aug. 31, 2012
Assets:
Goodwill	$ 57,416		$ 137,066
Fair Value, Inputs, Level 3
Assets:
Goodwill	$ 57,416	[1]	$ 137,066

[1] Level 3 assets and liabilities include goodwill which is valued based on unobservable inputs. See note 5 Goodwill for further discussion.