Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 41,900	$ 41,700	$ 169,589	$ 94,495
Other comprehensive loss:
Foreign currency translation adjustment	(4,815)	(112,792)	(22,228)	(113,727)
Total comprehensive income (loss)	$ 37,085	$ (71,092)	$ 147,361	$ (19,232)