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Mergers and Acquisitions (Details) (USD $)
12 Months Ended3 Months Ended
Oct. 02, 2011
Oct. 03, 2010
Oct. 02, 2011
Wardrop
Y
Sep. 27, 2009
2009 acquisitions
Oct. 03, 2010
2010 acquisitions
Jan. 02, 2011
BPR, Inc.
Y
Oct. 02, 2011
2011 acquisitions
Oct. 02, 2011
Acquisitions consummated after fiscal 2008
Oct. 02, 2011
Acquisitions consummated after fiscal 2009
Oct. 03, 2010
Acquisitions consummated after fiscal 2008 and 2009
Business acquisition          
Period for contingent earn-out payments (in years)  3  2    
Aggregate purchase price   $ 121,000,000$ 102,000,000$ 185,679,000$ 100,000,000   
Contingent earn-out payments of aggregate maximum upon achievement of specified financial objectives   44,000,00024,800,00039,200,00032,300,000   
Excess of the fair value of identifiable assets acquired and liabilities assumed over the purchase price   2,400,000      
Contingent consideration earned       44,300,000  
Contingent consideration paid to seller       17,900,000  
Amount accrued as part of Other current liabilities      4,500,000   
Initial payment    84,000,000157,000,00068,700,000   
Fair value of the contingent earn-out payments resulting in a discounted liability    17,600,00028,700,00027,100,000 48,700,00020,500,000
Contingent consideration accrued as part of Contingent earn-out liabilities        37,700,00010,500,000
Contingent earn-out payments recognized in Contingent earn-out liabilities64,119,00010,513,000        
Contingent consideration accrued as part of Other long-term liabilities        11,000,00010,000,000
Contingent consideration earned and accrued as part of Contingent earn-out liabilities       26,400,000  
Restricted cash accrued as part of Prepaid expenses and other current assets to settle contingent consideration payments under an earn-out arrangement      5,000,000   
Estimated fair values of the assets acquired and liabilities assumed          
Current assets     77,698,000    
Property and equipment     7,178,000    
Goodwill  88,200,000  128,140,000    
Intangible and other assets     36,988,000    
Current liabilities     (42,481,000)    
Long-term deferred taxes     (9,622,000)    
Noncontrolling interests     (12,222,000)    
Net assets acquired   $ 121,000,000$ 102,000,000$ 185,679,000$ 100,000,000