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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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