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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 01, 2017 | Oct. 02, 2016 | Jul. 02, 2017
Goodwill |  |  |
Balance at beginning of the period | $ 717,988 |  | $ 717,988
Goodwill additions |  |  | 7,055
Goodwill adjustments |  |  | 705
Foreign exchange impact |  |  | 3,590
Balance at end of the period |  | $ 717,988 | $ 729,338
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%
Eco Logical Australia |  |  |
Goodwill |  |  |
Goodwill additions |  |  | $ 7,100
Coffey and INDUS |  |  |
Goodwill |  |  |
Goodwill adjustments | 700 |  |
WEI |  |  |
Goodwill |  |  |
Balance at beginning of the period | 221,953 |  | 221,953
Goodwill adjustments |  |  | 13,509
Foreign exchange impact |  |  | 1,542
Balance at end of the period |  | 221,953 | 237,004
Gross amounts of goodwill |  | 304,400 | 319,400
Accumulated impairment |  |  | 82,400
RME |  |  |
Goodwill |  |  |
Balance at beginning of the period | $ 496,035 |  | 496,035
Goodwill additions |  |  | 7,055
Goodwill adjustments |  |  | (12,804)
Foreign exchange impact |  |  | 2,048
Balance at end of the period |  | 496,035 | 492,334
Gross amounts of goodwill |  | $ 529,200 | 525,500
Accumulated impairment |  |  | $ 33,200

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