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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, 2018	$ 1,300,903	$ 11	$ 684	$ 1,310,859	$ (10,651)
Beginning Balances (in shares) at Jan. 31, 2018		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 pronouncement	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
Beginning Balance at Jan. 31, 2019	$ 1,489,098	$ 11		1,516,190	(27,103)
Beginning Balances (in shares) at Jan. 31, 2019	105,642,283	105,642,283
Comprehensive income	$ 28,971			32,585	(3,614)
Share-based compensation	5,553		5,553
Share-based awards	974		974
Share-based awards (in shares)		563,989
Share repurchases	(76,625)	$ (1)	$ (6,527)	(70,097)
Share repurchases (in shares)		(2,606,908)
Ending Balance at Apr. 30, 2019	$ 1,447,971	$ 10		$ 1,478,678	$ (30,717)
Ending Balances (in shares) at Apr. 30, 2019	103,599,364	103,599,364

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