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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Aug. 25, 2012 | Aug. 27, 2011 | Aug. 28, 2010
Consolidated Statements of Income [Abstract] |  |  |  |  |  |
Revenues | $ 1,256,289 |  | $ 1,134,126 |  | $ 1,025,939 |
Operating expenses: |  |  |  |  |  |
Cost of revenues (1) | 797,944 | [1] | 712,309 | [1] | 620,727 | [1]
Selling and administrative expenses (1) | 240,798 | [1] | 233,111 | [1] | 213,463 | [1]
Depreciation and amortization | 66,439 |  | 64,733 |  | 61,477 |
Total operating expenses | 1,105,181 |  | 1,010,153 |  | 895,667 |
Income from operations | 151,108 |  | 123,973 |  | 130,272 |
Other expense (income): |  |  |  |  |  |
Interest expense | 2,132 |  | 6,738 |  | 8,778 |
Interest income | (2,738) |  | (2,552) |  | (2,104) |
Foreign exchange (gain) loss | 980 |  | (785) |  | 746 |
Total other expense | 374 |  | 3,401 |  | 7,420 |
Income before income taxes | 150,734 |  | 120,572 |  | 122,852 |
Provision for income taxes | 55,745 |  | 44,086 |  | 46,444 |
Net income | 94,989 |  | 76,486 |  | 76,408 |
Weighted average number of shares outstanding - Basic: |  |  |  |  |  |
Common Stock (in shares) | 19,916 |  | 19,854 |  | 19,564 |
Common Class A [Member] |  |  |  |  |  |
Other expense (income): |  |  |  |  |  |
Net income | 74,643 |  | 59,944 |  | 59,921 |
Income per share - Basic: |  |  |  |  |  |
Common Stock (in dollars per share) | $ 5.02 |  | $ 4.05 |  | $ 4.11 |
Income per share - Diluted: |  |  |  |  |  |
Common Stock (in dollars per share) | $ 4.76 |  | $ 3.85 |  | $ 3.90 |
Income allocated to - Basic: |  |  |  |  |  |
Common Stock | 74,643 |  | 59,944 |  | 59,921 |
Income allocated to - Diluted: |  |  |  |  |  |
Common Stock | 93,358 |  | 75,118 |  | 75,827 |
Weighted average number of shares outstanding - Basic: |  |  |  |  |  |
Common Stock (in shares) | 14,882 |  | 14,791 |  | 14,570 |
Weighted average number of shares outstanding - Diluted: |  |  |  |  |  |
Common Stock (in shares) | 19,616 |  | 19,532 |  | 19,458 |
Dividends per share: |  |  |  |  |  |
Common Stock (in dollars per share) | $ 0.15 |  | $ 0.15 |  | $ 0.15 |
Common Class B [Member] |  |  |  |  |  |
Other expense (income): |  |  |  |  |  |
Net income | 18,630 |  | 15,104 |  | 15,875 |
Income per share - Basic: |  |  |  |  |  |
Common Stock (in dollars per share) | $ 4.01 |  | $ 3.24 |  | $ 3.29 |
Income allocated to - Basic: |  |  |  |  |  |
Common Stock | $ 18,630 |  | $ 15,104 |  | $ 15,875 |
Weighted average number of shares outstanding - Basic: |  |  |  |  |  |
Common Stock (in shares) | 4,643 |  | 4,658 |  | 4,823 |
Dividends per share: |  |  |  |  |  |
Common Stock (in dollars per share) | $ 0.12 |  | $ 0.12 |  | $ 0.12 |
[1] | Exclusive of depreciation on the Company's property, plant and equipment and amortization of its intangible assets.

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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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