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Condensed Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Jan. 31, 2017					$ (34,069)
Comprehensive income	$ 13,738
Ending Balance at Apr. 30, 2017	$ 1,332,690				(32,269)
Ending Balances (in shares) at Apr. 30, 2017	116,290,358
Beginning Balance at Jan. 31, 2018	$ 1,300,903	$ 11	$ 684	$ 1,310,859	(10,651)
Beginning Balances (in shares) at Jan. 31, 2018	108,248,568	108,248,568
Comprehensive income	$ 33,198			41,260	(8,062)
Share-based compensation	5,524		5,524
Share-based awards	5,273		5,273
Share-based awards (in shares)		560,430
Cumulative effect of change in accounting pronouncements (see Note 2)	6,564			6,564
Share repurchases	(5,047)		(5,047)
Share repurchases (in shares)		(138,310)
Ending Balance at Apr. 30, 2018	$ 1,346,415	$ 11	$ 6,434	$ 1,358,683	$ (18,713)
Ending Balances (in shares) at Apr. 30, 2018	108,670,688	108,670,688

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