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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, 2017					$ (34,069)
Comprehensive income	$ 116,270
Ending Balance at Oct. 31, 2017	$ 1,284,808				(24,744)
Ending Balances (in shares) at Oct. 31, 2017	108,248,471
Beginning Balance at Jul. 31, 2017					(23,343)
Comprehensive income	$ 43,691
Ending Balance at Oct. 31, 2017	$ 1,284,808				(24,744)
Ending Balances (in shares) at Oct. 31, 2017	108,248,471
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	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 pronouncements (see Note 2)	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					(26,601)
Comprehensive income	$ 72,028
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

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