Long-Term Debt and Credit Arrangements - Schedule of Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 27, 2017	Jan. 27, 2017	Oct. 28, 2016	Oct. 27, 2017	Oct. 28, 2016
Debt Instrument [Line Items]
Capitalized interest	$ (15)		$ (116)	$ (23)	$ (314)
Total interest expense on outstanding borrowings	1,015		2,028	1,546	4,191
Accretion on note receivable	0		(574)	0	(1,133)
Other	0		(119)	(71)	(236)
Total interest income	0		(693)	(71)	(1,369)
Net interest expense from continuing operations	1,015		1,335	1,475	2,822
Mimi's Cafe
Debt Instrument [Line Items]
Sale note receivable		$ 30,000
Variable-rate debt
Debt Instrument [Line Items]
Interest expense, debt	939		1,840	1,385	3,805
Fixed-rate debt
Debt Instrument [Line Items]
Interest expense, debt	$ 91		$ 304	$ 184	$ 700