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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Statement Of Other Comprehensive Income [Abstract]
Net income, as reported	$ 41,422	$ 45,845
Other comprehensive income:
Unrealized gain on interest rate swaps, net of tax effects of $(164) and $(389)	301	692
Reclassification adjustment of interest rate swaps to net income, net of tax effects of $208 and $233	(378)	(416)
Foreign currency translation adjustments	14,558	7,062
Total comprehensive income	$ 55,903	$ 53,183

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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