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Stock-Based Compensation (Tables) | 6 Months Ended
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Oct. 27, 2012
Stock-Based Compensation [Abstract] |
Schedule of Grants Made During the Period | The table below summarizes the grants made during the first six months of fiscal 2013:
(Unaudited, shares/units in millions) |  | Shares/units granted |  | Liability/ Equity award |  | Settlement
Stock options |  | 0.2 |  | Equity |  | Common shares
Stock appreciation rights ("SARs") |  | 0.1 |  | Liability |  | Cash
Restricted stock units – employees |  | 0.2 |  | Liability |  | Cash
Restricted stock units – directors |  | Less than 0.1 |  | Equity |  | Common shares
Performance-based units |  | 0.1 |  | Liability |  | Cash
Performance-based shares |  | 0.1 |  | Equity |  | Common shares
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Valuation Assumptions | The fair value of stock options granted during the first quarter of fiscal 2013 was calculated using the following assumptions:
(Unaudited) |  | 7/28/12 |
Risk-free interest rate |  |  | 0.75 | %
Dividend rate |  |  | 0 | %
Expected life in years |  |  | 5.0 |
Stock price volatility |  |  | 84.0 | %
Fair value per share |  | $ | 7.88 |
Stock Appreciation Rights ("SARs") [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Valuation Assumptions | The fair value of the SARs granted during the first quarter of fiscal 2013 were remeasured at October 27, 2012, using the following assumptions:
(Unaudited) |  | 10/27/12 |
Risk-free interest rate |  |  | 0.75 | %
Dividend rate |  |  | 0 | %
Expected life in years |  |  | 5.0 |
Stock price volatility |  |  | 83.8 | %
Fair value per share |  | $ | 7.87 |

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- Definition Schedule of grants during the period for stock options, SARs, restricted stock units, performance-based units and performance based shares. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options and SARs , including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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