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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	118,119			134,069	(15,950)
Share-based compensation	10,990		10,990
Share-based awards	13,020		13,020
Share-based awards (in shares)		860,758
Cumulative effect of change in accounting pronouncement	6,564			6,564
Share repurchases	(5,924)		(5,924)
Share repurchases (in shares)		(158,018)
Ending Balance at Jul. 31, 2018	$ 1,443,672	$ 11	18,770	1,451,492	(26,601)
Ending Balances (in shares) at Jul. 31, 2018	108,951,308	108,951,308
Beginning Balance at Apr. 30, 2018	$ 1,346,415	$ 11	6,434	1,358,683	(18,713)
Beginning Balances (in shares) at Apr. 30, 2018		108,670,688
Comprehensive income	84,921			92,809	(7,888)
Share-based compensation	5,466		5,466
Share-based awards	7,747		7,747
Share-based awards (in shares)		300,328
Share repurchases	(877)		(877)
Share repurchases (in shares)		(19,708)
Ending Balance at Jul. 31, 2018	$ 1,443,672	$ 11	18,770	1,451,492	(26,601)
Ending Balances (in shares) at Jul. 31, 2018	108,951,308	108,951,308
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	$ 82,721			92,905	(10,184)
Share-based compensation	11,461		11,461
Share-based awards	974		974
Share-based awards (in shares)		568,989
Share repurchases	(222,850)	$ (1)	(12,435)	(210,414)
Share repurchases (in shares)		(8,246,260)
Ending Balance at Jul. 31, 2019	$ 1,361,404	$ 10		1,398,681	(37,287)
Ending Balances (in shares) at Jul. 31, 2019	97,965,012	97,965,012
Beginning Balance at Apr. 30, 2019	$ 1,447,971	$ 10		1,478,678	(30,717)
Beginning Balances (in shares) at Apr. 30, 2019		103,599,364
Comprehensive income	53,750			60,320	(6,570)
Share-based compensation	5,908		5,908
Share-based awards (in shares)		5,000
Share repurchases	(146,225)		$ (5,908)	(140,317)
Share repurchases (in shares)		(5,639,352)
Ending Balance at Jul. 31, 2019	$ 1,361,404	$ 10		$ 1,398,681	$ (37,287)
Ending Balances (in shares) at Jul. 31, 2019	97,965,012	97,965,012

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