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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 Balances at Jan. 31, 2013	$ 1,354,588	$ 15	$ 48,276	$ 1,315,079	$ (8,782)
Beginning Balances (in shares) at Jan. 31, 2013		146,015,767
Comprehensive income	290,174			282,360	7,814
Share-based compensation	15,742		15,742
Stock options and awards (in shares)		1,603,628
Stock options and awards	35,218		35,218
Excess tax benefit from share-based awards	9,540		9,540
Share repurchases (in shares)		(309,820)
Share repurchases	(11,092)		(11,092)
Ending Balances at Jan. 31, 2014	1,694,170	$ 15	97,684	1,597,439	(968)
Ending Balances (in shares) at Jan. 31, 2014		147,309,575
Comprehensive income	217,969			232,428	(14,459)
Share-based compensation	16,736		16,736
Stock options and awards (in shares)		723,083
Stock options and awards	10,693		10,693
Excess tax benefit from share-based awards	3,822		3,822
Share repurchases (in shares)		(17,529,794)
Share repurchases	(615,421)	$ (2)	(128,935)	(486,484)
Ending Balances at Jan. 31, 2015	$ 1,327,969	$ 13		1,343,383	(15,427)
Ending Balances (in shares) at Jan. 31, 2015	130,502,864	130,502,864
Comprehensive income	$ 216,465			224,489	(8,024)
Share-based compensation	15,623		15,623
Stock options and awards (in shares)		2,027,090
Stock options and awards	46,400		46,400
Excess tax benefit from share-based awards	6,194		6,194
Share repurchases (in shares)		(15,208,834)
Share repurchases	(475,424)	$ (1)	$ (68,217)	(407,206)
Ending Balances at Jan. 31, 2016	$ 1,137,227	$ 12		$ 1,160,666	$ (23,451)
Ending Balances (in shares) at Jan. 31, 2016	117,321,120	117,321,120

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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

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

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