Nature of Operations and Summary of Significant Accounting Policies (Summary of New Accounting Standard Impact) (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 29, 2019	Jul. 07, 2019	Apr. 14, 2019	Sep. 30, 2018	Jul. 08, 2018	Apr. 15, 2018	Jan. 20, 2019	Jan. 21, 2018	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 221,235	$ 222,359	$ 215,727	$ 177,472	$ 187,983	$ 209,772	$ 290,786	$ 294,463	$ 950,107	$ 869,690	$ 1,097,291
Selling, general and administrative expenses									76,357	104,816	117,280
Total operating costs and expenses, net									747,884	636,243	851,878
Earnings from operations	48,515	48,261	47,123	35,647	76,340	46,820	58,324	72,807	202,223	233,447	245,413
Earnings from continuing operations and before income taxes									115,772
Income tax expense									24,025	81,728	75,332
Earnings from continuing operations									91,747	104,339	128,573
Net earnings	22,061	$ 13,189	$ 25,089	16,269	$ 45,307	$ 47,605	$ 34,098	$ 12,190	94,437	121,371	135,332
Prepaid expenses	9,015			14,443					9,015	14,443
Total current assets	227,128			94,973					227,128	94,973
Deferred tax assets	85,564			62,140					85,564	62,140
Other assets, net	206,685			199,266					206,685	199,266
Total other assets	339,421			308,755					339,421	308,755
Total assets	958,483			823,397					958,483	823,397
Accrued liabilities	120,083			106,922					120,083	106,922
Total current liabilities	157,923			183,720					157,923	183,720
Other long-term liabilities	263,770			193,449					263,770	193,449
Total long-term liabilities	1,538,144			1,231,376					1,538,144	1,231,376
Retained earnings	1,577,034			1,561,353					1,577,034	1,561,353
Total stockholders’ deficit	(737,584)			(591,699)					(737,584)	(591,699)	(388,130)	$ (217,206)
Total liabilities and stockholders’ deficit	958,483			$ 823,397					958,483	823,397
Franchise royalties and other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									169,811	162,585	149,792
Franchise contributions for advertising and other services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									170,674	0	0
Franchise
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									272,815	259,047	231,578
Franchise advertising and other services expenses									178,093	$ 0	$ 0
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									775,688
Selling, general and administrative expenses									83,776
Total operating costs and expenses, net									577,210
Earnings from operations									198,478
Earnings from continuing operations and before income taxes									112,027
Income tax expense									23,053
Earnings from continuing operations									88,974
Net earnings									91,664
Prepaid expenses	9,987								9,987
Total current assets	228,100								228,100
Deferred tax assets	72,606								72,606
Other assets, net	206,954								206,954
Total other assets	326,732								326,732
Total assets	946,766								946,766
Accrued liabilities	115,105								115,105
Total current liabilities	152,945								152,945
Other long-term liabilities	222,475								222,475
Total long-term liabilities	1,496,849								1,496,849
Retained earnings	1,611,590								1,611,590
Total stockholders’ deficit	(703,028)								(703,028)
Total liabilities and stockholders’ deficit	946,766								946,766
Calculated under Revenue Guidance in Effect before Topic 606 | Franchise royalties and other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									166,066
Calculated under Revenue Guidance in Effect before Topic 606 | Franchise contributions for advertising and other services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									0
Calculated under Revenue Guidance in Effect before Topic 606 | Franchise
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Franchise advertising and other services expenses									0
Calculated under Revenue Guidance in Effect before Topic 606 | Franchise Fees | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(3,745)
Earnings from operations									(3,745)
Earnings from continuing operations and before income taxes									(3,745)
Income tax expense									(972)
Earnings from continuing operations									(2,773)
Net earnings									(2,773)
Prepaid expenses	972								972
Total current assets	972								972
Deferred tax assets	(12,958)								(12,958)
Other assets, net	269								269
Total other assets	(12,689)								(12,689)
Total assets	(11,717)								(11,717)
Accrued liabilities	(4,978)								(4,978)
Total current liabilities	(4,978)								(4,978)
Other long-term liabilities	(41,295)								(41,295)
Total long-term liabilities	(41,295)								(41,295)
Retained earnings	34,556								34,556
Total stockholders’ deficit	34,556								34,556
Total liabilities and stockholders’ deficit	$ (11,717)								(11,717)
Calculated under Revenue Guidance in Effect before Topic 606 | Franchise Fees | Franchise royalties and other | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(3,745)
Calculated under Revenue Guidance in Effect before Topic 606 | Marketing and Sourcing Fees | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(161,873)
Total operating costs and expenses, net									(161,873)
Calculated under Revenue Guidance in Effect before Topic 606 | Marketing and Sourcing Fees | Franchise contributions for advertising and other services | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(161,873)
Calculated under Revenue Guidance in Effect before Topic 606 | Marketing and Sourcing Fees | Franchise | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Franchise advertising and other services expenses									(161,873)
Calculated under Revenue Guidance in Effect before Topic 606 | Technology Support Fees | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(8,801)
Selling, general and administrative expenses									7,419
Total operating costs and expenses, net									(8,801)
Calculated under Revenue Guidance in Effect before Topic 606 | Technology Support Fees | Franchise contributions for advertising and other services | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues									(8,801)
Calculated under Revenue Guidance in Effect before Topic 606 | Technology Support Fees | Franchise | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Franchise advertising and other services expenses									$ (16,220)