Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 76,412	$ 39,328	$ 127,689	$ 52,795
Other comprehensive loss:
Foreign currency translation adjustment	(25,893)	(47,796)	(17,413)	(935)
Total comprehensive income (loss)	$ 50,519	$ (8,468)	$ 110,276	$ 51,860