Goodwill and Intangible Assets - Schedule of Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016
Goodwill [Roll Forward]
Balance at beginning of the period	$ 717,988	$ 601,379
Goodwill additions	7,055	107,618
Goodwill adjustments	705	1,687
Foreign exchange translation	15,138	7,304
Balance at end of the period	740,886	717,988
WEI
Goodwill [Roll Forward]
Balance at beginning of the period	221,953	210,748
Goodwill additions	0	9,080
Goodwill adjustments	13,509	0
Foreign exchange translation	6,273	2,125
Balance at end of the period	241,735	221,953
RME
Goodwill [Roll Forward]
Balance at beginning of the period	496,035	390,631
Goodwill additions	7,055	98,538
Goodwill adjustments	(12,804)	1,687
Foreign exchange translation	8,865	5,179
Balance at end of the period	$ 499,151	$ 496,035