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Acquisitions - Preliminary Identified Intangible Assets Acquired (Details) - USD ($) $ in Millions	Jul. 03, 2021	Jun. 27, 2020	Jun. 29, 2019	May 31, 2019	Oct. 30, 2018
Business Acquisition [Line Items]
Goodwill	$ 396.5	$ 381.4	$ 381.1
3Z Telecom, Inc.
Business Acquisition [Line Items]
Tangible assets acquired				$ 4.1
Goodwill				12.2
Total consideration transferred				28.7
3Z Telecom, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired:				4.4
3Z Telecom, Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired:				7.9
3Z Telecom, Inc. | Customer backlog
Business Acquisition [Line Items]
Intangible assets acquired:				$ 0.1
RPC Photonics, Inc.
Business Acquisition [Line Items]
Tangible assets acquired					$ 5.7
Goodwill					33.9
Total consideration transferred					69.6
RPC Photonics, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired:					15.7
RPC Photonics, Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired:					14.0
RPC Photonics, Inc. | Customer backlog
Business Acquisition [Line Items]
Intangible assets acquired:					$ 0.3

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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