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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, 2015	$ 1,327,969	$ 13		$ 1,343,383	$ (15,427)
Beginning Balances (in shares) at Jan. 31, 2015		130,502,864
Comprehensive income	216,465			224,489	(8,024)
Share-based compensation	15,623		$ 15,623
Share-based awards	46,400		46,400
Share-based awards (in shares)		2,027,090
Excess tax benefit from share-based awards	6,194		6,194
Share repurchases	(475,424)	$ (1)	(68,217)	(407,206)
Share repurchases (in shares)		(15,208,834)
Ending Balance at Jan. 31, 2016	1,137,227	$ 12		1,160,666	(23,451)
Ending 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	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

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Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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