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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 04, 2013	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		0	161,205	200,346
Compensation expense		$ 0.8	$ 0.5	$ 1.3
Compensation expense, net of tax		0.2	0.3	0.8
Unrecognized compensation cost related to unvested stock options		$ 0.6
Weighted-average period		7 months 6 days
Cash received for stock option exercises		$ 5.9	2.0	1.0
Realized tax provision		$ 0.2
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued percentage of target number of underlying stock award units		0.00%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued percentage of target number of underlying stock award units		150.00%
Stock Award Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards cliff-vested period		3 years
Compensation expense		$ 3.8	1.8	3.2
Compensation expense, net of tax		$ 1.2	1.1	2.0
Weighted-average period		2 years 4 months 24 days
Unrecognized compensation cost		$ 7.8
Fair value of stock award units vested		3.1	2.6	4.8
Fair value of unvested stock award units		14.3	$ 10.5	$ 10.3
Realized tax expense on vested stock awards		$ 0.3
Employee Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock shares	11,000,000
Options granted to participants exercisable period	3 years
Stock awards cliff-vested period	3 years

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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