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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Aug. 25, 2012
Summary of Significant Accounting Policies [Abstract] |
Estimated Useful Lives of Property, Plant, and Equipment | Property, plant and equipment are recorded at cost. Expenditures for maintenance and repairs are expensed as incurred, while expenditures for renewals and betterments are capitalized. 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
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 | 2012 | 2011 | 2010
Risk-free interest rate |  | 1.54 | % | 1.98 | % | 2.97 | %
Expected dividend yield |  | 0.56 | % | 0.60 | % | 0.62 | %
Expected life in years |  | 7.39 |  | 7.32 |  | 7.39 |
Expected volatility |  | 33.8 | % | 34.8 | % | 39.3 | %
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):
|  | August 25, |  |  | August 27, |  |  | August 28, |
Year ended |  | 2012 |  |  | 2011 |  |  | 2010 |
Net income available to shareholders |  | $ | 94,989 |  |  | $ | 76,486 |  |  | $ | 76,408 |
Allocation of net income for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 74,643 |  |  | $ | 59,944 |  |  | $ | 59,921 |
Class B Common Stock |  |  | 18,630 |  |  |  | 15,104 |  |  |  | 15,875 |
Unvested participating shares |  |  | 1,716 |  |  |  | 1,438 |  |  |  | 612 |
|  | $ | 94,989 |  |  | $ | 76,486 |  |  | $ | 76,408 |
Weighted average number of shares for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  | 14,882 |  |  |  | 14,791 |  |  |  | 14,570 |
Class B Common Stock |  |  | 4,643 |  |  |  | 4,658 |  |  |  | 4,823 |
Unvested participating shares |  |  | 391 |  |  |  | 405 |  |  |  | 171 |
|  |  | 19,916 |  |  |  | 19,854 |  |  |  | 19,564 |
Earnings per share for Basic: |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  | $ | 5.02 |  |  | $ | 4.05 |  |  | $ | 4.11 |
Class B Common Stock |  | $ | 4.01 |  |  | $ | 3.24 |  |  | $ | 3.29 |
Schedule of Earnings Per Share, Diluted, Two Class Method | For the years ended August 25, 2012, August 27, 2011 and August 28, 2010, 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):
|  | Year Ended August 25, 2012 |  | Year Ended August 27, 2011 |  | Year Ended August 28, 2010
|  | Earnings |  |  |  |  |  | Earnings |  |  |  |  |  | Earnings |  |  |  |
|  | to Common |  | Common |  |  |  | to Common |  | Common |  |  |  | to Common |  | Common |  |
|  | shareholders |  | Shares |  | EPS |  | shareholders |  | Shares |  | EPS |  | shareholders |  | Shares |  | EPS
As reported - Basic | $ | 74,643 |  | 14,882 |  | $ 5.02 | $ | 59,944 |  | 14,791 |  | $ 4.05 | $ | 59,921 |  | 14,570 |  | $ 4.11
Add: effect of dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Awards |  | - |  | 91 |  |  |  | - |  | 83 |  |  |  | - |  | 65 |  |
Class B Common Stock |  | 18,630 |  | 4,643 |  |  |  | 15,104 |  | 4,658 |  |  |  | 15,875 |  | 4,823 |  |
Add: Undistributed earnings allocated to unvested participating shares |  | 1,664 |  | - |  |  |  | 1,385 |  | - |  |  |  | 598 |  | - |  |
Less: Undistributed earnings reallocated to unvested participating shares |  | (1,579 | ) | - |  |  |  | (1,315 | ) | - |  |  |  | (567 | ) | - |  |
Diluted EPS - Common Stock |  | 93,358 |  | 19,616 |  | $ 4.76 |  | 75,118 |  | 19,532 |  | $ 3.85 |  | 75,827 |  | 19,458 |  | $ 3.90

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