Consolidated Statement Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 79,250	$ 75,866	$ 134,650	$ 109,565
Other comprehensive loss:
Foreign currency translation adjustment, net of tax	(31,822)	(102,055)	(72,345)	(190,307)
Unrealized gain on cash flow hedges, net of tax	269	0	58	0
Other comprehensive income (loss)	(31,553)	(102,055)	(72,287)	(190,307)
Total comprehensive income (loss)	$ 47,697	$ (26,189)	$ 62,363	$ (80,742)