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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, 2020	$ 1,455,355	$ 10	$ 9,477	$ 1,473,872	$ (28,004)
Beginning Balances (in shares) at Jan. 31, 2020		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
Beginning Balance at Jan. 31, 2021	$ 1,477,358	$ 10	19,360	1,475,108	(17,120)
Beginning Balances (in shares) at Jan. 31, 2021	97,815,985	97,815,985
Comprehensive income (loss)	$ 58,926			53,547	5,379
Share-based compensation	4,570		4,570
Share-based awards	1,073		1,073
Share-based awards (in shares)		637,836
Share repurchases	(7,418)		(7,418)
Share repurchases (in shares)		(218,694)
Ending Balance at Apr. 30, 2021	$ 1,534,509	$ 10	$ 17,585	$ 1,528,655	$ (11,741)
Ending Balances (in shares) at Apr. 30, 2021	98,235,127	98,235,127

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