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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jan. 01, 2017 | Oct. 02, 2016
Goodwill |  |
Balance at beginning of the period | $ 717,988 |
Goodwill adjustments | 705 |
Foreign exchange impact | (8,954) |
Balance at end of the period | $ 709,739 | $ 717,988
Impairment of goodwill |  | 0
Income approach |  |
Goodwill |  |
Weighted rate used in fair value of goodwill (as a percent) | 70.00% |
Discounted cash flow and market approach |  |
Goodwill |  |
Weighted rate used in fair value of goodwill (as a percent) | 30.00% |
Coffey |  |
Goodwill |  |
Goodwill adjustments | $ 700 |
WEI |  |
Goodwill |  |
Balance at beginning of the period | 221,953 |
Goodwill adjustments | 13,509 |
Foreign exchange impact | (2,300) |
Balance at end of the period | 233,162 | 221,953
Gross amounts of goodwill | 315,600 | 304,400
Accumulated impairment | 82,400 | 82,400
RME |  |
Goodwill |  |
Balance at beginning of the period | 496,035 |
Goodwill adjustments | (12,804) |
Foreign exchange impact | (6,654) |
Balance at end of the period | 476,577 | 496,035
Gross amounts of goodwill | 509,800 | 529,200
Accumulated impairment | $ 33,200 | $ 33,200

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