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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% |

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