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Retirement Benefit Plans (Expense Actuarial Assumptions) (Details)
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8 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||
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Sep. 30, 2012
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Oct. 15, 2011
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Feb. 02, 2013
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Jan. 28, 2012
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Jan. 29, 2011
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| Retirement Benefit Plans [Abstract] | |||||||||||
| Expected return on plan assets | 7.50% | 7.50% | 8.40% | ||||||||
| Discount rate | 4.82% | [1] | 5.65% | [2] | 5.90% | ||||||
| Salary increase | 4.70% | 4.70% | 4.70% | ||||||||
| Discount rate at remeasurement date October 15, 2011 | 4.25 | 5.06 | |||||||||
| Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption | The expected return on plan assets is based on the plan's long-term asset allocation policy, historical returns for plan assets and overall capital market returns, taking into account current and expected market conditions. In 2010 and 2009, the expected return on plan assets was 8.4%, which was reduced from the 2008 rate of 8.9% as a result of the negative returns in the capital markets and lowered expected future returns. For 2012 and 2011, we further reduced the expected rate of return assumption to 7.5% from 8.4% to align our expected rate of return with our new asset allocation targets. The expected return assumption for 2013 is further reduced from 7.5% to 7.0% given our new asset allocation targets and updated expected capital markets return assumptions. | ||||||||||
| Defined Benefit Plan, Assumptions Used in Calculations, Narrative Description | The discount rate used to measure pension expense each year is the rate as of the beginning of the year (i.e., the prior measurement date). The discount rate used was based on an externally published yield curve determined by the plan's actuary. The yield curve is a hypothetical AA yield curve represented by a series of bonds maturing from six months to 30 years, designed to match the corresponding pension benefit cash payments to retirees. Beginning with the remeasurement on September 30, 2012, the discount rate used was based on a hypothetical AA yield curve represented by a series of bonds maturing over the next 30 years, designed to match the corresponding pension benefit cash payments to retirees. The salary progression rate to measure pension expense was based on age ranges and projected forward. | ||||||||||
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