Shareholders' Equity | Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 43,786	$ 288,292
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(41,098)	(88,252)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	364	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,052	200,040
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	43,786	288,292
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(40,523)	(88,252)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,263	200,040
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(575)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	364	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (211)	$ 0