Revolving Credit Facilities and Long-Term Debt - Revolving Credit Facilities and Long-Term Debt (Details)					3 Months Ended		9 Months Ended
	Jun. 06, 2019 USD ($)	May 15, 2018 USD ($)	Jun. 02, 2017 USD ($)	Jun. 29, 2015 USD ($)	Jun. 27, 2020 USD ($)	Jun. 29, 2019 USD ($)	Dec. 29, 2018	Mar. 28, 2020 USD ($)	May 26, 2017 USD ($)
Interest expense
Revolving credit facilities and long-term debt
Amortization of deferred loan fees					$ 200,000	$ 300,000
Golub Term Loan
Revolving credit facilities and long-term debt
Principal amount	$ 111,500,000			$ 200,000,000.0
Interest expense					$ 1,600,000	$ 2,900,000
Weighted average interest rate (as a percent)					5.80%	7.10%
Periodic payment					$ 500,000
Repayments of loan	65,000,000.0	$ 10,000,000.0	$ 10,000,000.0
Additional interest rate required if certain triggering events come into existence (as a percent)				2.00%
Deferred loan fees				$ 7,100,000
Term loan					111,500,000			$ 111,500,000
Unamortized value of the debt issuance costs and debt discount					(2,288,000)			(2,478,000)
Total					109,212,000			109,022,000
Golub Term Loan | Base rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				3.50%
Golub Term Loan | Federal funds rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				0.50%
Golub Term Loan | One-month LIBOR rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				1.00%
Golub Term Loan | LIBOR
Revolving credit facilities and long-term debt
Basis margin (as a percent)				4.50%
Golub Term Loan | Minimum | LIBOR
Revolving credit facilities and long-term debt
Interest rate (as a percent)				1.00%
Golub Term Loan | Leverage ratio as of December 2018 | Maximum
Revolving credit facilities and long-term debt
Consolidated total net leverage ratio							4.00
Wells Fargo Revolver
Revolving credit facilities and long-term debt
Borrowing capacity	$ 165,000,000.0			$ 125,000,000.0					$ 135,000,000.0
Commitment fee on unused capacity (as a percentage)				0.25%
Amount outstanding under 2015 Wells Fargo Revolver					129,900,000			129,900,000
Interest expense					$ 600,000	$ 600,000
Weighted average interest rate (as a percent)					1.70%	3.80%
Additional interest rate required if certain triggering events come into existence (as a percent)				2.00%
Deferred loan fees				$ 1,200,000
Unamortized value of the debt issuance costs and debt discount					$ (300,000)			$ (400,000)
Wells Fargo Revolver | Federal funds rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				0.50%
Wells Fargo Revolver | One-month LIBOR rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				1.00%
Wells Fargo Revolver | Minimum
Revolving credit facilities and long-term debt
Consolidated fixed charge coverage ratio				1.00
Wells Fargo Revolver | Minimum | Base rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				0.00%
Wells Fargo Revolver | Minimum | LIBOR
Revolving credit facilities and long-term debt
Basis margin (as a percent)				1.00%
Wells Fargo Revolver | Maximum | Base rate
Revolving credit facilities and long-term debt
Basis margin (as a percent)				0.25%
Wells Fargo Revolver | Maximum | LIBOR
Revolving credit facilities and long-term debt
Basis margin (as a percent)				1.25%