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Acquisitions - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 29, 2021	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Purchase price, net of cash acquired				$ 73,749,000	$ (590,000)
Amortization of intangibles		$ 9,696,000	$ 16,104,000	28,745,000	48,306,000
Selling, general and administrative expense		109,963,000	$ 85,037,000	313,966,000	$ 275,129,000
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
Receivables	5,036,000
Adjustment to goodwill		600,000
Tax basis in acquired goodwill	$ 0
Post-acquisition revenues		7,600,000		20,500,000
Post-acquisition income (loss) before taxes of acquiree		(2,900,000)		(7,100,000)
Acquisition related costs		600,000		2,300,000
Amortization of intangibles		1,400,000		3,700,000
Inventory adjustment		$ 400,000		2,400,000
Opterna International Corp.
Business Acquisition [Line Items]
Estimated earnout consideration				0		$ 5,800,000
Selling, general and administrative expense				$ 5,800,000

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Tax Basis In Acquired Goodwill

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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