Acquisitions - Narrative (Details) - USD ($) $ in Millions				3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 16, 2025	Jan. 28, 2025	Oct. 05, 2022	Jun. 27, 2026	Sep. 27, 2025	Jun. 28, 2025	Mar. 28, 2026	Mar. 29, 2025	Jun. 28, 2025	Dec. 27, 2025
Business Combination [Line Items]
Cash consideration							$ 399.3	$ 117.9
Fair value of contingent consideration						$ 117.4	68.2		$ 117.4
Payments for previous acquisition							0.7	$ 0.0
Spirent Communications PLC
Business Combination [Line Items]
Cash consideration	$ 399.3
Acquisition related costs	$ 20.6						11.4
Inertial Labs, LLC
Business Combination [Line Items]
Cash consideration		$ 134.4				3.7
Acquisition related costs									11.7
Earn out payments		$ 175.0
Target period		4 years
Fair value of contingent consideration		$ 116.2				117.1	68.2		117.1	$ 139.1
Cash acquired from acquisition		16.5
Payments to acquire businesses, net of cash acquired		121.6
Escrow payment		1.0
Payment for contingent consideration liability, investing activities						3.0
Payments for (proceeds from) acquisition adjustment						0.7
Consideration transferred						$ 1.4
Payments for previous acquisition					$ 0.7
Acquisition related holdback		15.0
Acquisition related holdback, reduction							$ 1.1
Acquisition related costs, transaction costs									$ 9.5
Inertial Labs, LLC | Forecast
Business Combination [Line Items]
Refund of prepaid tax				$ 0.6
Inertial Labs, LLC | Retention Bonuses
Business Combination [Line Items]
Earn out payments		$ 3.4
Target period		4 years
Jackson Labs Technologies, LLC
Business Combination [Line Items]
Fair value of contingent consideration			$ 117.0
Total purchase consideration			$ 49.9