Basis Of Presentation Adoption for Topic 606 Revenue Recognition (Details) - USD ($) $ in Thousands		4 Months Ended
		Jan. 20, 2019	Jan. 21, 2018	Sep. 30, 2018	Oct. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		$ 290,786	$ 294,463
Franchise advertising and other services expenses		54,270
Selling, General and Administrative Expense		24,083	34,061
Total operating costs and expenses, net		232,462	221,092
Earnings from operations		58,324	73,371
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		40,494	60,027
Income taxes	[1]	9,373	47,138
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		31,121	12,889
Net earnings		34,098	12,190
Prepaid expenses		10,367		$ 14,443
Total current assets		96,546		94,973
Deferred tax assets		77,295		62,140
Other Assets, Noncurrent		199,462		199,266
Assets, Noncurrent		324,015		308,755
Assets		828,852		823,397
Accrued Liabilities, Current		100,429		106,922
Liabilities, Current		187,656		183,720
Other long-term liabilities		234,816		193,449
Liabilities, Noncurrent		1,248,492		1,231,376
Retained Earnings (Accumulated Deficit)		1,547,759		1,561,353
Stockholders' Equity Attributable to Parent		(607,296)	(374,560)	(591,699)	$ (388,130)
Liabilities and Equity		828,852		$ 823,397
Royalty and Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		52,250	47,609
Franchise contributions for advertising and other services [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		51,814	$ 0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		237,880
Franchise advertising and other services expenses		0
Selling, General and Administrative Expense		26,539
Total operating costs and expenses, net		180,648
Earnings from operations		57,232
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		39,402
Income taxes		9,091
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		30,311
Net earnings		33,288
Prepaid expenses		10,649
Total current assets		96,828
Deferred tax assets		64,337
Other Assets, Noncurrent		199,731
Assets, Noncurrent		311,326
Assets		816,445
Accrued Liabilities, Current		95,466
Liabilities, Current		182,693
Other long-term liabilities		190,854
Liabilities, Noncurrent		1,204,530
Retained Earnings (Accumulated Deficit)		1,584,277
Stockholders' Equity Attributable to Parent		(570,778)
Liabilities and Equity		816,445
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Royalty and Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		51,158
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Franchise contributions for advertising and other services [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		0
Franchise Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		(1,092)
Franchise advertising and other services expenses		0
Selling, General and Administrative Expense		0
Total operating costs and expenses, net		0
Earnings from operations		(1,092)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		(1,092)
Income taxes		(282)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		(810)
Net earnings		(810)
Prepaid expenses		282
Total current assets		282
Deferred tax assets		(12,958)
Other Assets, Noncurrent		269
Assets, Noncurrent		(12,689)
Assets		(12,407)
Contract with Customer, Liability, Current		(4,963)
Liabilities, Current		(4,963)
Other long-term liabilities		(43,962)
Liabilities, Noncurrent		(43,962)
Retained Earnings (Accumulated Deficit)		36,518
Stockholders' Equity Attributable to Parent		36,518
Liabilities and Equity		(12,407)
Franchise Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Royalty and Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		(1,092)
Franchise Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Franchise contributions for advertising and other services [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		0
Marketing And Sourcing Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		(49,097)
Franchise advertising and other services expenses		(49,097)
Selling, General and Administrative Expense		0
Total operating costs and expenses, net		(49,097)
Earnings from operations		0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0
Income taxes		0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		0
Net earnings		0
Prepaid expenses		0
Total current assets		0
Deferred tax assets		0
Other Assets, Noncurrent		0
Assets, Noncurrent		0
Assets		0
Accrued Liabilities, Current		0
Liabilities, Current		0
Other long-term liabilities		0
Liabilities, Noncurrent		0
Retained Earnings (Accumulated Deficit)		0
Stockholders' Equity Attributable to Parent		0
Liabilities and Equity		0
Marketing And Sourcing Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Royalty and Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		0
Marketing And Sourcing Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Franchise contributions for advertising and other services [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		(49,097)
Technology And Support Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		(2,717)
Franchise advertising and other services expenses		(5,173)
Selling, General and Administrative Expense		2,456
Total operating costs and expenses, net		(2,717)
Earnings from operations		0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0
Income taxes		0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent		0
Net earnings		0
Prepaid expenses		0
Total current assets		0
Deferred tax assets		0
Other Assets, Noncurrent		0
Assets, Noncurrent		0
Assets		0
Accrued Liabilities, Current		0
Liabilities, Current		0
Other long-term liabilities		0
Liabilities, Noncurrent		0
Retained Earnings (Accumulated Deficit)		0
Stockholders' Equity Attributable to Parent		0
Liabilities and Equity		0
Technology And Support Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Royalty and Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		0
Technology And Support Fees [Member] | Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Franchise contributions for advertising and other services [Domain]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues		$ (2,717)

[1] Percentages may not add due to rounding.