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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, 2016	$ 1,137,227	$ 12		$ 1,160,666	$ (23,451)
Beginning Balances (in shares) at Jan. 31, 2016		117,321,120
Comprehensive income	207,502			218,120	(10,618)
Share-based compensation	18,291		$ 18,291
Share-based awards	4,096		4,096
Share-based awards (in shares)		293,130
Excess tax deficiencies from share-based awards	(6,193)		(6,193)
Share repurchases	(47,839)		(16,194)	(31,645)
Share repurchases (in shares)		(1,380,469)
Ending Balance at Jan. 31, 2017	1,313,084	$ 12		1,347,141	(34,069)
Ending 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	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

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