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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2019
Jun. 30, 2019
Sep. 30, 2018
Finite-lived intangible assets      
Gross Amount $ 96,722   $ 86,237
Accumulated Amortization (80,282)   (70,114)
Estimated amortization expense      
2020   $ 9,401  
2021   4,551  
2022   1,602  
2023   $ 886  
Total 16,440    
Non-compete agreements      
Finite-lived intangible assets      
Gross Amount 0   83
Accumulated Amortization $ 0   (83)
Client relations      
Finite-lived intangible assets      
Weighted- Average Remaining Life (in years) 2 years 9 months 18 days    
Gross Amount $ 56,779   54,639
Accumulated Amortization $ (50,455)   (46,449)
Backlog      
Finite-lived intangible assets      
Weighted- Average Remaining Life (in years) 1 year 2 months 12 days    
Gross Amount $ 32,229   23,371
Accumulated Amortization $ (24,968)   (20,007)
Technology and trade names      
Finite-lived intangible assets      
Weighted- Average Remaining Life (in years) 2 years 3 months 18 days    
Gross Amount $ 7,714   8,144
Accumulated Amortization $ (4,859)   $ (3,575)