Consolidated Statement Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 41,700	$ 37,716	$ 94,495	$ 70,171
Other comprehensive income [Abstract]
Foreign currency translation adjustment	(112,792)	51,408	(113,727)	1,843
Total comprehensive (loss) income	$ (71,092)	$ 89,124	$ (19,232)	$ 72,014