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Goodwill and Intangible Assets Valuation Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 27, 2015
Mar. 27, 2016
Goodwill $ 601,379 $ 716,244
RME    
Goodwill 390,631 495,753
RME | WMG    
Fair value of business 103,500  
Carrying value of business $ 93,900  
Goodwill   $ 56,500
RME | WMG | US treasury bonds    
Impairment of goodwill    
Maturity of investments whose yield is considered in determination of impairment   20 years
RME | WMG | Maximum    
Percentage of excess of fair value over carrying value 20.00%  
Goodwill. | RME | WMG    
Discounted cash flow rate (as a percent) 11.00%  
Revenue multiple 1.0  
Preceding period used for revenue multiple 12 months  
Impairment of goodwill    
Maximum percentage of revenue growth that could indicate goodwill impairment   2.00%
Minimum decline in future market prices of similar businesses that could indicate goodwill impairment   10.00%
Minimum discounted cash flow rate (as a percent)   14.00%
Goodwill. | RME | WMG | Minimum    
Annual revenue growth rate (as a percent) 3.00%  
Goodwill. | RME | WMG | 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%