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Consolidated Statements 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	$ 1,313,084	$ 12		$ 1,347,141	$ (34,069)
Beginning Balances (in shares) at Jan. 31, 2017		116,233,781
Comprehensive income	131,681			108,263	23,418
Share-based compensation	14,517		$ 14,517
Share-based awards (in shares)		200,148
Cumulative effect of change in accounting pronouncement	847		1,607	(760)
Share repurchases	(159,226)	$ (1)	(15,440)	(143,785)
Share repurchases (in shares)		(8,185,361)
Ending Balance at Jan. 31, 2018	1,300,903	$ 11	684	1,310,859	(10,651)
Ending Balances (in shares) at Jan. 31, 2018		108,248,568
Comprehensive income	281,551			298,003	(16,452)
Share-based compensation	18,104		18,104
Share-based awards	13,618		13,618
Share-based awards (in shares)		1,147,896
Cumulative effect of change in accounting pronouncement	6,564			6,564
Share repurchases	(131,642)		(32,406)	(99,236)
Share repurchases (in shares)		(3,754,181)
Ending Balance at Jan. 31, 2019	$ 1,489,098	$ 11		1,516,190	(27,103)
Ending Balances (in shares) at Jan. 31, 2019	105,642,283	105,642,283
Comprehensive income	$ 167,195			168,096	(901)
Share-based compensation	21,109		21,109
Share-based awards	974		974
Share-based awards (in shares)		588,158
Share repurchases	(223,021)	$ (1)	(12,606)	(210,414)
Share repurchases (in shares)		(8,253,626)
Ending Balance at Jan. 31, 2020	$ 1,455,355	$ 10	$ 9,477	$ 1,473,872	$ (28,004)
Ending Balances (in shares) at Jan. 31, 2020	97,976,815	97,976,815

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