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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 27, 2011
Summary of Significant Accounting Policies [Abstract] |
Estimated Useful Lives of Property, Plant, and Equipment | The Company provides for depreciation on the straight-line method based on the following estimated useful lives:
Buildings | 30-40 years
Leasehold improvements | Shorter of useful life or term of lease
Machinery and equipment | 3-10 years
Motor vehicles | 3-5 years
Schedule of Earnings Per Share, Basic, Two Class Method | The following table sets forth the computation of basic earnings per share using the two-class method for amounts attributable to the Company's shares of Common Stock and Class B Common Stock (in thousands, except per share data):
Year ended |  | August 27, 2011 |  |  | August 28, 2010 |  |  | August 29, 2009 |
Net income available to shareholders |  | $ | 76,486 |  |  | $ | 76,408 |  |  | $ | 75,852 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 59,944 |  |  | $ | 59,921 |  |  | $ | 59,526 |
Class B Common Stock |  |  | 15,104 |  |  |  | 15,875 |  |  |  | 16,326 |
Unvested participating shares |  |  | 1,438 |  |  |  | 612 |  |  |  | - |
|  | $ | 76,486 |  |  | $ | 76,408 |  |  | $ | 75,852 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 14,791 |  |  |  | 14,570 |  |  |  | 14,394 |
Class B Common Stock |  |  | 4,658 |  |  |  | 4,823 |  |  |  | 4,935 |
Unvested participating shares |  |  | 405 |  |  |  | 171 |  |  |  | - |
|  |  | 19,854 |  |  |  | 19,564 |  |  |  | 19,329 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 4.05 |  |  | $ | 4.11 |  |  | $ | 4.14 |
Class B Common Stock |  | $ | 3.24 |  |  | $ | 3.29 |  |  | $ | 3.31 |
Schedule of Earnings Per Share, Diluted, Two Class Method | For the year ended August 27, 2011, the Company's diluted EPS assumes the conversion of all vested Class B Common Stock into Common Stock and uses the two-class method for its unvested participating shares as follows (in thousands, except per share data):
|  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 59,944 |  |  |  | 14,791 |  |  | $ | 4.05 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |
Common Stock options |  |  | - |  |  |  | 83 |  |  |  |  |
Class B Common Stock |  |  | 15,104 |  |  |  | 4,658 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 1,385 |  |  |  | - |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (1,315 | ) |  |  | - |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 75,118 |  |  |  | 19,532 |  |  | $ | 3.85 |
Share based awards that would result in the issuance of 116,487 shares of Common Stock were excluded from the calculation of diluted earnings per share for the year ended August 27, 2011 because they were anti-dilutive. For the year ended August 28, 2010, the Company's diluted EPS assumed the conversion of all vested Class B Common Stock into Common Stock and used the two-class method for its unvested participating shares as follows (in thousands, except per share data):
|  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 59,921 |  |  |  | 14,570 |  |  | $ | 4.11 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |
Common Stock options |  |  | - |  |  |  | 65 |  |  |  |  |
Class B Common Stock |  |  | 15,875 |  |  |  | 4,823 |  |  |  |  |
Add: Undistributed earnings allocated to unvested participating shares |  |  | 598 |  |  |  | - |  |  |  |  |
Less: Undistributed earnings reallocated to unvested participating shares |  |  | (567 | ) |  |  | - |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 75,827 |  |  |  | 19,458 |  |  | $ | 3.90 |
Share based awards that would result in the issuance of 118,800 shares of Common Stock were excluded from the calculation of diluted earnings per share for the year ended August 28, 2010 because they were anti-dilutive. For the year ended August 29, 2009, the Company's diluted EPS assumed the conversion of all vested Class B Common Stock into Common Stock and used the treasury stock method as follows (in thousands, except per share data):
|  | Year ended August 29, 2009 |
|  | Earnings to Common shareholders |  |  | Common Shares |  |  | EPS |
As reported - Basic |  | $ | 59,526 |  |  |  | 14,394 |  |  | $ | 4.14 |
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |
Common Stock options |  |  | - |  |  |  | 44 |  |  |  |  |
Class B Common Stock |  |  | 16,326 |  |  |  | 4,935 |  |  |  |  |
Diluted EPS – Common Stock |  | $ | 75,852 |  |  |  | 19,373 |  |  | $ | 3.92 |
Stock Options, Valuation Assumptions | The fair value of each Share-Based Award is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions used:
Fiscal year ended August |  | 2011 |  |  | 2010 |  |  | 2009 |
Risk-free interest rate |  |  | 1.98 | % |  |  | 2.97 | % |  |  | 2.82 | %
Expected dividend yield |  |  | 0.60 | % |  |  | 0.62 | % |  |  | 0.76 | %
Expected life in years |  |  | 7.32 |  |  |  | 7.39 |  |  |  | 7.34 |
Expected volatility |  |  | 34.8 | % |  |  | 39.3 | % |  |  | 38.6 | %

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