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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	190,147			211,589	(21,442)
Share-based compensation	17,076		17,076
Share-based awards	13,618		13,618
Share-based awards (in shares)		1,142,897
Cumulative effect of change in accounting pronouncement	6,564			6,564
Share repurchases	(67,699)		(31,378)	(36,321)
Share repurchases (in shares)		(1,752,619)
Ending Balance at Oct. 31, 2018	$ 1,460,609	$ 11		1,492,691	(32,093)
Ending Balances (in shares) at Oct. 31, 2018	107,638,846	107,638,846
Beginning Balance at Jul. 31, 2018	$ 1,443,672	$ 11	18,770	1,451,492	(26,601)
Beginning Balances (in shares) at Jul. 31, 2018		108,951,308
Comprehensive income	72,028			77,520	(5,492)
Share-based compensation	6,086		6,086
Share-based awards	598		598
Share-based awards (in shares)		282,139
Share repurchases	(61,775)		(25,454)	(36,321)
Share repurchases (in shares)		(1,594,601)
Ending Balance at Oct. 31, 2018	$ 1,460,609	$ 11		1,492,691	(32,093)
Ending Balances (in shares) at Oct. 31, 2018	107,638,846	107,638,846
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	$ 145,969			148,557	(2,588)
Share-based compensation	16,807		16,807
Share-based awards	974		974
Share-based awards (in shares)		585,658
Share repurchases	(222,995)	$ (1)	(12,580)	(210,414)
Share repurchases (in shares)		(8,252,598)
Ending Balance at Oct. 31, 2019	$ 1,429,853	$ 10	5,201	1,454,333	(29,691)
Ending Balances (in shares) at Oct. 31, 2019	97,975,343	97,975,343
Beginning Balance at Jul. 31, 2019	$ 1,361,404	$ 10		1,398,681	(37,287)
Beginning Balances (in shares) at Jul. 31, 2019		97,965,012
Comprehensive income	63,248			55,652	7,596
Share-based compensation	5,346		5,346
Share-based awards (in shares)		16,669
Share repurchases	(145)		(145)
Share repurchases (in shares)		(6,338)
Ending Balance at Oct. 31, 2019	$ 1,429,853	$ 10	$ 5,201	$ 1,454,333	$ (29,691)
Ending Balances (in shares) at Oct. 31, 2019	97,975,343	97,975,343

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