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Goodwill and Intangible Assets (Details 2) - USD ($)
$ in Thousands
9 Months Ended
Jun. 28, 2015
Sep. 28, 2014
Goodwill $ 684,909 $ 714,190
RME    
Goodwill 459,586 $ 476,104
RME | GMP    
Fair value of business 102,800  
Carrying value of business 91,800  
Goodwill $ 62,200  
RME | GMP | US treasury bonds    
Impairment of goodwill    
Maturity of investments whose yield is considered in determination of impairment 20 years  
Goodwill. | RME | GMP    
Discounted cash flow rate (as a percent) 14.00%  
Revenue multiple 0.7  
Impairment of goodwill    
Significant contraction in mining activity period 2 years  
Goodwill. | RME | GMP | Minimum    
Annual revenue growth rate (as a percent) 3.00%  
Impairment of goodwill    
Decline in future revenue leading to goodwill impairment (as a percent) 20.00%  
Decline in future market prices of similar businesses leading to goodwill impairment (as a percent) 15.00%  
Discounted cash flow rate leading to impairment of goodwill (as a percent) 15.50%  
Goodwill. | RME | GMP | Maximum    
Annual revenue growth rate (as a percent) 5.00%  
Income approach    
Weighted rate used in fair value of goodwill (as a percent) 70.00%  
Discounted cash flow and market approach    
Weighted rate used in fair value of goodwill (as a percent) 30.00%