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Goodwill and Intangible Assets (Details 2) (USD $)
12 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Oct. 02, 2011
Finite-lived intangible assets      
Gross Amount $ 208,171,000 $ 167,528,000  
Accumulated Amortization (121,242,000) (93,297,000)  
Amortization expense for intangible assets 32,400,000 29,600,000 28,000,000
Estimated amortization expense      
2014 26,815,000    
2015 19,328,000    
2016 15,875,000    
2017 13,626,000    
2018 6,333,000    
Beyond 4,952,000    
Total 86,929,000    
Non-compete agreements
     
Finite-lived intangible assets      
Weighted-Average Remaining Life 2 years 7 months 6 days    
Gross Amount 6,160,000 5,467,000  
Accumulated Amortization (5,247,000) (4,685,000)  
Client relations
     
Finite-lived intangible assets      
Weighted-Average Remaining Life 4 years 6 months    
Gross Amount 128,839,000 99,096,000  
Accumulated Amortization (49,189,000) (31,477,000)  
Backlog
     
Finite-lived intangible assets      
Weighted-Average Remaining Life 4 months 24 days    
Gross Amount 68,968,000 59,931,000  
Accumulated Amortization (64,675,000) (55,908,000)  
Technology and trade names
     
Finite-lived intangible assets      
Weighted-Average Remaining Life 2 years 10 months 24 days    
Gross Amount 4,204,000 3,034,000  
Accumulated Amortization $ (2,131,000) $ (1,227,000)