Taxes on Income - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 03, 2018	Dec. 31, 2017	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Income Taxes
Federal net operating loss carryforwards	$ 25.4		$ 25.4
State net operating loss carryforwards	15.3		15.3
Federal net operating loss carryforwards that do not expire	9.7		9.7
Federal net operating loss carryforwards that expire in 2016	15.7		15.7
Foreign net operating loss carryforwards	52.7		52.7
Federal and state tax credit carryforwards	1.7		1.7
Valuation allowance provided during the year to reduce the carrying value of the underlying deferred tax assets			10.6
Deferred tax assets	0.0		0.0
Valuation Allowance	$ 16.5		$ 16.5
U.S. corporate income tax rates	21.00%	32.80%	32.80%	34.00%	34.00%
Decrease in its deferred tax assets and the associated valuation allowance			$ 7.4
Federal tax
Income Taxes
Period of statute of limitations			3 years
State tax
Income Taxes
Period of statute of limitations			4 years