Acquisitions - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 29, 2021	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Purchase price, net of cash acquired				$ 73,749,000	$ (590,000)
Amortization of intangibles		$ 9,102,000	$ 16,017,000	19,049,000	32,202,000
Selling, general and administrative expense		105,554,000	$ 91,703,000	204,003,000	$ 190,092,000
OTN Systems N.V.
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	100.00%
Purchase price, net of cash acquired	$ 73,300,000
Long-term debt acquired	1,841,000
Adjustment to goodwill		200,000
Receivables	5,036,000
Tax basis in acquired goodwill	$ 0
Post-acquisition revenues		8,800,000		12,900,000
Post-acquisition income (loss) before taxes of acquiree		(800,000)		(4,200,000)
Acquisition related costs		300,000		1,700,000
Amortization of intangibles		700,000		2,300,000
Inventory adjustment		$ 1,200,000		2,000,000.0
Opterna International Corp.
Business Acquisition [Line Items]
Estimated earnout consideration				0		$ 5,800,000
Selling, general and administrative expense				$ 5,800,000