Other Gains and Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 27, 2017	Sep. 27, 2017	Dec. 28, 2016	Sep. 28, 2016	Dec. 27, 2017	Dec. 28, 2016
Other Gains and Charges [Abstract]
Restaurant closure charges	$ 4,306		$ 321	$ 2,500	$ 4,544	$ 2,827
Restaurant impairment charges	1,974	$ 7,159	1,851		9,133	1,851
Lease guarantee charges	1,433		0		1,433	0
SalesPriceofJV	18,000
Equity Method Investment, Realized Gain (Loss) on Disposal	200
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5,400
Cumulative losses as of June 27, 2017 reclassified from AOCL due to disposition	5,899
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	519
Foreign Currency Transaction Gain (Loss), before Tax	(882)		0		(882)	0
Gain (Loss) on Disposition of Assets	348		2,569		303	2,569
Information technology restructuring	$ 0		$ 209	$ 2,500	$ 0	$ 2,700