Business Divestiture - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended
		May 14, 2020	Jun. 28, 2020	Sep. 29, 2019	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	[1]					$ 15,417	$ 40,491
Gain on disposition			$ 10,458		$ 137,286	10,458	143,400
Tax expense			3,068		$ 6,068	4,937	$ 11,865
Operations and maintenance | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses				$ 36,300		16,000
Escrow holdback reserve			$ 5,300			$ 5,300
Holdback related to business divestitures		$ 15,000
Amortization period, contract cost			3 years			3 years
Gain on disposition						$ 10,500
Transaction expense						$ 2,700
Tax expense			$ 1,000

[1] Amount for the six months ended June 28, 2020 is net of de-consolidated cash of $0.6 million