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Business Combinations (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 01, 2012
May 26, 2012
Feb. 25, 2012
Nov. 26, 2011
Aug. 27, 2011
May 28, 2011
Feb. 26, 2011
Nov. 27, 2010
Sep. 01, 2012
Aug. 27, 2011
Aug. 28, 2010
Business Acquisition [Line Items]                      
Revenue $ 635,271 $ 611,970 $ 562,974 $ 545,703 $ 533,237 $ 532,366 $ 483,362 $ 472,827 $ 2,355,918 $ 2,021,792 $ 1,692,041
Income before income tax                 412,142 349,330 240,828
ATS Industrial Suppy, Inc. [Member]
                     
Business Acquisition [Line Items]                      
Revenue                 20,126    
Income before income tax                 1,554    
Acquisition-related expenses 2,223               2,223    
Cash purchase price of acquisition 32,204               32,204    
Acquired intangible assets 12,808               12,808    
Useful life of acquired intangibles                 15 years    
Goodwill 11,693               11,693    
Post-closing working capital adjustment paid out to sellers 1,247               1,247    
ATS Industrial Suppy, Inc. [Member] | Customer Relationships [Member]
                     
Business Acquisition [Line Items]                      
Acquired intangible assets $ 11,700               $ 11,700    
Useful life of acquired intangibles                 8 years