Other Gains and Charges - Schedule of Other Gains and Charges (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
Severance	0		209	$ 2,200	293	2,368
Settlement reserves net of settlement proceeds	0		(2,032)		0	(2,032)
Acquisition costs	0		0		0	580
Other	1,494		1,268		2,282	1,911
Gains And Charges Other	$ 1,306		$ (87)		$ 7,384	$ 1,590