Reconciliations of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Income Tax Disclosure [Abstract]
Beginning balance	$ 219,132	$ 113,414	$ 84,942
Additions for tax positions of prior years	16,533	82,965	48,986
Reductions for tax positions of prior years	(3,843)	(7,713)	(10,446)
Additions for tax positions related to current year	18,219	30,886	12,316
Adjustments for tax positions related to disposed entities	(1,917)
Adjustments for tax positions related to acquired entities	(3,195)	21,000
Cash settlements	(9,406)	(1,096)	(7,880)
Reductions from lapses in statutes of limitations	(1,909)	(784)	(2,521)
Reductions from settlements with taxing authorities	(4,344)	(19,930)	(9,680)
Foreign exchange rate adjustment	414	390	(2,303)
Ending balance	229,684	219,132	113,414
Unrecognized tax benefits that would affect the effective tax rate (if recognized)	$ 72,586	$ 72,618	$ 65,677