Goodwill and Intangible Assets - Narrative (Details) - USD ($)		3 Months Ended
	Jul. 01, 2019	Dec. 29, 2019	Sep. 29, 2019	Dec. 30, 2018
Goodwill [Line Items]
Impairment of goodwill	$ 0
Estimated fair values that exceeded their carrying values, percent (more than)	25.00%
Total Assets		$ 2,352,553,000	$ 2,147,408,000
Goodwill		937,068,000	924,820,000
Amortization expense		$ 2,900,000		$ 4,000,000.0
Income approach, discounted cash flow method
Goodwill [Line Items]
Weighted rate used in fair value of goodwill (as a percent)		70.00%
Market approach
Goodwill [Line Items]
Weighted rate used in fair value of goodwill (as a percent)		30.00%
GSG
Goodwill [Line Items]
Gross amounts of goodwill		$ 462,000,000.0	459,500,000
Accumulated impairment		17,700,000	17,700,000
Goodwill		444,304,000	441,802,000
CIG
Goodwill [Line Items]
Gross amounts of goodwill		598,500,000	588,700,000
Accumulated impairment		105,700,000	105,700,000
Goodwill		$ 492,764,000	483,018,000
RFS
Goodwill [Line Items]
Impairment of goodwill			7,800,000
Total Assets			61,000,000
Goodwill			$ 48,800,000