Shareholders' Equity/Capital Stock - Stock Options (Details) (1993 Plan and 2003 Plan, USD $)	4 Months Ended
Sep. 18, 2012	Sep. 20, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year	399,586
Granted	0
Exercised	(320,417)
Forfeited or expired	(3,166)
Outstanding at end of quarter	76,003
Exercisable at end of quarter	67,834
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of year	$ 23.96
Granted	$ 0.00
Exercised	$ 23.31
Forfeited or expired	$ 22.94
Outstanding at end of quarter	$ 18.25
Exercisable at end of quarter	$ 19.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at end of quarter, Weighted Avg. Remaining Contractual Term	4 years 10 months 28 days
Exercisable at end of quarter, Weighted Avg. Remaining Contractual Term	4 years 6 months 26 days
Outstanding at end of quarter, Aggregate Intrinsic Value	$ 306,000
Exercisable at end of quarter, Aggregate Intrinsic Value	222,000
Total intrinsic value of stock options exercised during period	2,779,000	16,000
Chief executive officer
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised	(136,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of stock options exercised during period	1,278,000
Excess tax benefit recorded from the exercise of stock options	$ 324,000

Employee Service Share-based Compensation, Excess Tax Benefit Realized from Exercise of Stock Options

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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