Acquisitions and Divestitures - Consolidated Business Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 03, 2020	Jun. 27, 2019	Dec. 31, 2020	Dec. 31, 2019	Jan. 03, 2020	Sep. 30, 2020
Purchase price allocation
Goodwill			$ 787,741			$ 784,882
Sales and results of operations
Sales			318,794	$ 328,839
Operating loss			1,297	(6,483)
Net loss after taxes			(12,995)	(20,575)
Gain from changes in fair value of contingent consideration			(576)	$ (3,005)
PIXIA Corp
Estimated acquisition-date fair value of consideration
Fair value of consideration transferred	$ 197,800				$ 245,200
Purchase price allocation
Accounts receivable, prepaids and other assets		$ 3,800
Deferred tax liability		(17,600)
Other net assets acquired (liabilities assumed)		(1,800)
Net identifiable assets acquired		72,200
Goodwill		173,000
Net assets acquired		$ 245,200
Weighted average useful life of intangible assets		4 years
Sales and results of operations
Sales			2,300
Operating loss			(8,000)
Net loss after taxes			(8,000)
Amortization			7,200
Acquisition-related expenses			500
Estimated amortization expense related to the intangible assets
2021			28,700
2022			12,700
2023			7,300
2024			7,300
2025			7,300
Thereafter			3,200
PIXIA Corp | Trade names
Purchase price allocation
Indefinite intangible assets		$ 5,700
PIXIA Corp | Backlog
Purchase price allocation
Amortizable intangible assets		42,500
PIXIA Corp | Customer relationships
Purchase price allocation
Amortizable intangible assets		25,500
PIXIA Corp | Technology
Purchase price allocation
Amortizable intangible assets		$ 14,100
Delerrok Inc.
Estimated acquisition-date fair value of consideration
Fair value of consideration transferred	45,100
Purchase price allocation
Accounts receivable	900				900
Deferred tax liability	(1,700)				(1,700)
Other net assets acquired (liabilities assumed)	(300)				(300)
Net identifiable assets acquired	14,700				14,700
Goodwill	30,400				30,400
Net assets acquired	$ 45,100				45,100
Weighted average useful life of intangible assets	10 years
Sales and results of operations
Sales			300
Operating loss			(1,100)
Net loss after taxes			(1,100)
Amortization			400
Acquisition-related expenses			400
Gain from changes in fair value of contingent consideration			(900)
Estimated amortization expense related to the intangible assets
2021			1,700
2022			1,600
2023			1,600
2024			1,600
2025			1,600
Thereafter			$ 6,400
Delerrok Inc. | Trade names
Purchase price allocation
Indefinite intangible assets	$ 900				900
Delerrok Inc. | Technology
Purchase price allocation
Amortizable intangible assets	$ 14,900				$ 14,900