Restructuring and Other Charges - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	May 31, 2017 USD ($) Store	Sep. 30, 2017 USD ($) Store	Oct. 01, 2016 USD ($)	Sep. 30, 2017 USD ($) Store	Oct. 01, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 5.9	$ 0.0	$ 5.9	$ 0.0
Restructuring liability		$ 0.9		$ 0.9
Retail Fleet Optimization Plan
Restructuring Cost and Reserve [Line Items]
Number of stores expected to close | Store		38		38
Duration of restructuring plan	2 years
Anticipated annual savings	$ 60.0
Number of store closed | Store				10
Retail Fleet Optimization Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Number of stores expected to close | Store	100
Expected restructuring charges	$ 100.0
Retail Fleet Optimization Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Number of stores expected to close | Store	125
Expected restructuring charges	$ 125.0
Lease Termination and Store Closure Costs
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring				$ 5.0