Consolidated Statement Of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 75,866	$ 47,459	$ 109,565	$ 78,113
Other comprehensive (loss) income:
Foreign currency translation adjustment	(102,055)	195,438	(190,307)	229,101
Total comprehensive (loss) income	$ (26,189)	$ 242,897	$ (80,742)	$ 307,214