Consolidated Statement Of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 48,065	$ 55,400
Other comprehensive loss:
Foreign currency translation adjustment, net of tax	(56,547)	(40,523)
Unrealized loss on cash flow hedges, net of tax	(15)	(211)
Other comprehensive loss	(56,562)	(40,734)
Total comprehensive (loss) income	$ (8,497)	$ 14,666