Debt and Capital Lease Obligations - Debt Covenants (Details) $ in Millions	6 Months Ended
	Jul. 31, 2017 USD ($)
Debt Disclosure [Abstract]
Debt Instrument, Actual Interest Coverage Ratio	1.83
Minimum Interest Coverage Ratio	0.80
Debt Instrument, Actual Leverage Ratio	2.42
Debt Instrument, Maximum Leverage Ratio	4
Debt Instrument, Actual ABS Excluded Leverage Ratio	1.33
Debt Instrument, Maximum ABS Excluded Leverage Ratio	2
Debt Instrument, Actual Cash Recovery Percentage	5.01%
ABS Excluded Leverage Ratio must not exceed maximum	4.45%
Capital Expenditures, net, must not exceed maximum	$ 3.1
Maximum Capital Expenditures, Net	$ 75.0