Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Lessee, Operating Lease, Description [Abstract]
Option to extend			true
Lessee, operating lease, option to terminate			The exercise of lease renewal options is generally at the Company’s sole discretion. The exercise of lease termination options is generally by mutual agreement between the Company and the lessor.
Variable lease costs and short-term lease costs including rent forgiveness	$ (4.3)		$ (0.9)
Variable and short term cost		$ 2.7		$ 5.0
Impairment charge related to the operating lease assets	$ 19.4
Minimum
Lessee, Operating Lease, Description [Abstract]
Operating lease, contract term	1 year		1 year
Renewal term	1 year		1 year
Maximum
Lessee, Operating Lease, Description [Abstract]
Operating lease, contract term	10 years		10 years
Renewal term	10 years		10 years