Debt and Financing Lease Obligations - Debt Covenants (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2020 USD ($)
Debt Disclosure [Abstract]
Debt Instrument, Minimum Interest Coverage Ratio	1.00
Debt Instrument, Minimum Interest Coverage Ratio, Trailing Two Quarters	1.50
Determination period		12 months
Actual
Leverage Ratio must not exceed (maximum)	1.95
ABS Excluded Leverage Ratio must not exceed (maximum)	1.18
Capital Expenditures, net, must not exceed (maximum)		$ 34.0
Required Minimum/ Maximum
Leverage Ratio must not exceed (maximum)	4.50
ABS Excluded Leverage Ratio must not exceed (maximum)	2.50
Capital Expenditures, net, must not exceed (maximum)		$ 100.0