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Net Income per Common Share - Reconciliation between basic and diluted net income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Net Income (Loss) per Common Share
Net income (loss)	$ 63,174	$ 95,387	$ 8,903	$ 118,549
Basic net income (loss) per share:
Basic common shares	48,359	47,768	48,201	48,333
Basic net income (loss) per share (in dollars per share)	$ 1.31	$ 2.00	$ 0.18	$ 2.45
Diluted net income (loss) per share:
Basic common shares	48,359	47,768	48,201	48,333
Diluted restricted stock awards and stock options	450	588	388	723
Diluted common shares	48,809	48,356	48,589	49,056
Diluted net income (loss) per share (in dollars per share)	$ 1.29	$ 1.97	$ 0.18	$ 2.42

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