Accounting Policies - Defined Contribution Pension Plans Disclosures (Details) (USD $)	4 Months Ended
	Sep. 18, 2012	Sep. 20, 2011
401 (k) Plan - Salaried Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, description of vesting period	immediate
401 (k) Plan - Executive Savings Plan | Mutual funds
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Increase (decrease) in deferred compensation assets and liabilities due to executive compensation plan	$ 154,000	$ 278,000
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Hourly Savings Plan | After January 1, 1999
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	40.00%
Maximum annual contribution per employee, percent	10.00%
Employer matching contribution, vesting period	4 years
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Hourly Savings Plan | After 4 years of service
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Percentage of Employer's matching contribution vesting after four years of service	100.00%
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Salaried Savings Plan | Before June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	10.00%
Maximum annual contribution per employee, percent	18.00%
Maximum annual contribution allowed per employee, percent	25.00%
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Executive Savings Plan | Mutual funds or comany's common stock | Before June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Maximum annual contribution per employee, percent	10.00%
Maximum annual contribution allowed per employee, percent	25.00%
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Executive Savings Plan | Mutual funds | Before June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	10.00%
Old Plan, Amended September 1, 2009 | 401 (k) Plan - Executive Savings Plan | Company's common stock | Before June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	15.00%
Current Plan, Effective September 1, 2009 | 401 (k) Plan - Hourly Savings Plan | No hire date eligibility requirement for employee plan participation
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	100.00%
Maximum annual contribution per employee, percent	3.00%
Employer matching contribution, description of vesting period	immediate
Current Plan, Effective September 1, 2009 | 401 (k) Plan - Salaried Savings Plan | After June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	100.00%
Maximum annual contribution per employee, percent	3.00%
Current Plan, Effective September 1, 2009 | 401 (k) Plan - Executive Savings Plan | Mutual funds or comany's common stock
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Maximum annual contribution per employee, percent	3.00%
Current Plan, Effective September 1, 2009 | 401 (k) Plan - Executive Savings Plan | Mutual funds or comany's common stock | After June 30, 2009
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution, percent	100.00%