Impairment, Disposition Of Property And Equipment, And Restaurant Closing Costs (Accrued Restaurant Closing Costs, Included In Accrued Liabilities And Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 10, 2011	Jul. 04, 2010	Jul. 10, 2011	Jul. 04, 2010
Balance at beginning of period	$ 22,163	$ 5,230	$ 25,020	$ 4,234
Additions and adjustments	379	310	1,163	1,934
Cash payments	(1,661)	(379)	(5,302)	(1,007)
Balance at end of period	$ 20,881	$ 5,161	$ 20,881	$ 5,161
Jack In The Box [Member]
Number of restaurants closed		1		4