Revenue Recognition - Narrative (Details)		3 Months Ended	6 Months Ended
	Apr. 01, 2018 USD ($)	Sep. 29, 2018 USD ($) store_format	Sep. 29, 2018 USD ($) store_format	Mar. 31, 2018 USD ($)
Contract With Customer, Asset And Liability [Line Items]
Number Of Retail Store Formats | store_format		4	4
Return liabilities		$ 25,900,000	$ 25,900,000	$ 12,100,000
Right to recover returned product		7,500,000	7,500,000
Contract with customer liability		17,500,000	17,500,000	23,300,000
Gift card breakage recognized to revenue	$ 4,600,000
Revenue recognized during period		3,200,000	11,300,000
Contract assets	$ 0	0	0
Gift Cards
Contract With Customer, Asset And Liability [Line Items]
Contract with customer liability		10,600,000	10,600,000
Loyalty Program
Contract With Customer, Asset And Liability [Line Items]
Contract with customer liability		$ 5,800,000	$ 5,800,000	$ 2,200,000