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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, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statement Of Other Comprehensive Income [Abstract]
Net income, as reported	$ 45,345	$ 39,640	$ 86,767	$ 85,485
Other comprehensive income:
Unrealized gain on interest rate swaps, net of tax effects of $(331), $(534), $(495) and $(924)	591	962	892	1,653
Reclassification adjustment of interest rate swaps to net income, net of tax effects of $204, $226, $412 and $460	(366)	(418)	(744)	(833)
Foreign currency translation adjustments	737	(2,109)	15,295	4,953
Total comprehensive income	$ 46,307	$ 38,075	$ 102,210	$ 91,258

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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