Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Net income	$ 9,809	$ 19,615	$ 14,190	$ 23,641
Other comprehensive income, net of tax:
Foreign currency translation adjustment	2,518	(2,782)	5,721	(5,092)
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $14 and $0 for the three months ended January 31, 2013 and 2012, respectively, and $(10) and $0 for the six months ended January 31, 2013 and 2012, respectively.	29	25	(18)	25
Total other comprehensive income	$ 12,356	$ 16,858	$ 19,893	$ 18,574