Acquisitions - Net Purchase Price and Fair Values of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands				3 Months Ended
	Jul. 03, 2017	Apr. 03, 2017	Nov. 04, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Consideration transferred
Net purchase price				$ 6,000	$ 0
Estimated fair value of tangible assets acquired and liabilities assumed
Estimated fair value of goodwill				$ 384,200		$ 380,846
RTL
Estimated fair value of tangible assets acquired and liabilities assumed
Net purchase price	$ 6,000
Delta
Consideration transferred
Cash paid at closing		$ 40,500
Net purchase price		40,500
Estimated fair value of tangible assets acquired and liabilities assumed
Accounts receivable and cost in excess of billings		957
Inventory		4,452
Fixed assets		1,918
Other current and non-current assets		67
Current liabilities		(1,854)
Estimated fair value of net tangible assets acquired		5,540
Estimated fair value of identifiable intangible assets		17,000
Estimated fair value of goodwill		17,960
Estimated fair value of assets acquired		40,500
Net purchase price		$ 40,500
CES Creative Electronic Systems S.A.
Consideration transferred
Cash paid at closing			$ 39,123
Working capital adjustment			(330)
Net purchase price			38,793
Estimated fair value of tangible assets acquired and liabilities assumed
Accounts receivable and cost in excess of billings			2,698
Inventory			8,950
Fixed assets			1,480
Other current and non-current assets			748
Current liabilities			(3,154)
Non-current liabilities			(6,140)
Deferred tax liabilities			(857)
Estimated fair value of net tangible assets acquired			3,725
Estimated fair value of identifiable intangible assets			14,722
Estimated fair value of goodwill			20,346
Estimated fair value of assets acquired			38,793
Net purchase price			$ 39,123