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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Statement Of Other Comprehensive Income [Abstract]
Net income, as reported	$ 39,640	$ 40,603	$ 85,485	$ 81,752
Other comprehensive income:
Interest rate swaps, net of tax effects of $308, $(684), $464, and $(684)	544	(2,459)	820	(3,073)
Foreign currency translation adjustments	(2,109)	(6,114)	4,953	(9,614)
Total comprehensive income	$ 38,075	$ 32,030	$ 91,258	$ 69,065

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