Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	4 Months Ended
Jan. 18, 2015	Jan. 19, 2014
Cash flows from operating activities:
Net earnings	$ 35,835us-gaap_NetIncomeLoss	$ 32,286us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	27,370	28,454
Deferred finance cost amortization	661us-gaap_AmortizationOfFinancingCosts	675us-gaap_AmortizationOfFinancingCosts
Excess Tax Benefit from Share-based Compensation, Operating Activities	(14,533)	(5,307)
Deferred income taxes	973us-gaap_DeferredIncomeTaxExpenseBenefit	(4,846)us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expense	3,885us-gaap_ShareBasedCompensation	3,801us-gaap_ShareBasedCompensation
Pension and postretirement expense	5,769	4,233
Gains on cash surrender value of company-owned life insurance	(574)	(3,117)
Gains on the sale of company-operated restaurants	(850)	(461)
Losses on the disposition of property and equipment	(1,243)	(992)
Impairment charges and other	215jack_ImpairmentChargesAndOther	393jack_ImpairmentChargesAndOther
Changes in assets and liabilities, excluding acquisitions and dispositions:
Accounts and other receivables	3,999us-gaap_IncreaseDecreaseInReceivables	1,582us-gaap_IncreaseDecreaseInReceivables
Inventories	(121)us-gaap_IncreaseDecreaseInInventories	(682)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	16,683	622
Accounts payable	(4,623)	(5,636)
Accrued liabilities	(20,063)	(16,781)
Pension and postretirement contributions	(6,880)	(6,558)
Other	(1,642)	(5,998)
Cash flows provided by operating activities	47,347	23,652
Cash flows from investing activities:
Purchases of property and equipment	(19,885)	(21,310)
Proceeds from sale and leaseback of assets	0	2,105
Proceeds from the sale of company-operated restaurants	1,174	468
Collections on notes receivable	5,050	894
Acquisitions of franchise-operated restaurants	0	(1,750)
Other	22	36
Cash flows used in investing activities	(13,639)	(19,557)
Cash flows from financing activities:
Borrowings on revolving credit facilities	154,000	163,000
Repayments of borrowings on revolving credit facilities	(98,000)	(103,000)
Principal repayments on debt	(5,279)us-gaap_RepaymentsOfLongTermDebt	(10,330)us-gaap_RepaymentsOfLongTermDebt
Payments of Ordinary Dividends	(7,791)us-gaap_PaymentsOfOrdinaryDividends	0us-gaap_PaymentsOfOrdinaryDividends
Proceeds from issuance of common stock	11,302	17,650
Repurchases of common stock	(104,669)	(84,318)
Excess tax benefits from share-based compensation arrangements	14,533	5,307
Change in book overdraft	423	7,880
Cash flows used in financing activities	(35,481)	(3,811)
Effect of Exchange Rate on Cash and Cash Equivalents	3	5
Net increase in cash and cash equivalents	(1,770)	289
Cash and cash equivalents at beginning of period	10,578	9,644
Cash and cash equivalents at end of period	$ 8,808	$ 9,933

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration