Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 195,095	$ 265,736	$ 175,172
Other comprehensive loss:
Foreign currency translation adjustment	(41,217)	(84,087)	(273,809)
Total comprehensive income (loss)	$ 153,878	$ 181,649	$ (98,637)