Acquisitions - Preliminary Allocation of Purchase Price (Details) - USD ($) $ in Millions	May 31, 2019	Oct. 30, 2018	Mar. 15, 2018	Aug. 09, 2017
3Z Telecom, Inc.
Business Acquisition [Line Items]
Cash	$ 2.2
Total other assets	3.6
Total liabilities	(1.7)
Net tangible assets acquired	$ 4.1
RPC Photonics, Inc.
Business Acquisition [Line Items]
Cash		$ 1.8
Other current assets		1.8
Property and equipment		2.6
Total liabilities		(0.5)
Net tangible assets acquired		$ 5.7
AW
Business Acquisition [Line Items]
Cash			$ 16.1
Accounts receivable			43.0
Inventory			33.5
Property and equipment			33.5
Other assets			6.1
Accounts payable			(10.9)
Other liabilities			(28.4)
Deferred revenue			(10.2)
Deferred tax liabilities			(23.7)
Net tangible assets acquired			$ 59.0
Trilithic
Business Acquisition [Line Items]
Cash				$ 0.2
Accounts receivable				3.2
Inventory				10.1
Property and equipment				1.2
Accounts payable				(1.7)
Other liabilities				(1.2)
Net tangible assets acquired				$ 11.8