Other Gains and Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 28, 2016	Sep. 28, 2016	Dec. 23, 2015	Sep. 23, 2015	Dec. 28, 2016	Dec. 23, 2015
Other Gains and Charges [Abstract]
Gain on the sale of assets, net	$ (2,569)		$ 0	$ (1,800)	$ (2,569)	$ (1,762)
Restaurant impairment charges	1,851		468		1,851	525
Restaurant closure charges	321	$ 2,500	0		2,827	0
Information technology restructuring	209	$ 2,500	0		2,700	0
Proceeds from Legal Settlements			(2,000)
Expenses related to a bankrupt franchisee			1,200
Severance	$ 0		$ 209	$ 2,200	$ 293	$ 2,368