Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 340,580	$ 116,641	$ 195,095
Other comprehensive (loss) income:
Foreign currency translation adjustment	(244,506)	362,834	(41,217)
Total comprehensive income	$ 96,074	$ 479,475	$ 153,878