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Condensed 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, 2019	$ 1,489,098	$ 11		$ 1,516,190	$ (27,103)
Beginning Balances (in shares) at Jan. 31, 2019		105,642,283
Comprehensive income (loss)	28,971			32,585	(3,614)
Share-based compensation	5,553		$ 5,553
Share-based awards	974		974
Share-based awards (in shares)		563,989
Share repurchases	(76,625)	$ (1)	(6,527)	(70,097)
Share repurchases (in shares)		(2,606,908)
Ending Balance at Apr. 30, 2019	$ 1,447,971	$ 10		1,478,678	(30,717)
Ending Balances (in shares) at Apr. 30, 2019	103,599,364	103,599,364
Beginning Balance at Jan. 31, 2020	$ 1,455,355	$ 10	9,477	1,473,872	(28,004)
Beginning Balances (in shares) at Jan. 31, 2020	97,976,815	97,976,815
Comprehensive income (loss)	$ (151,363)			(138,442)	(12,921)
Share-based compensation	4,872		4,872
Share-based awards (in shares)		437,174
Share repurchases	(10,756)		(10,756)
Share repurchases (in shares)		(636,667)
Ending Balance at Apr. 30, 2020	$ 1,298,108	$ 10	$ 3,593	$ 1,335,430	$ (40,925)
Ending Balances (in shares) at Apr. 30, 2020	97,777,322	97,777,322

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