Acquisitions (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended				5 Months Ended	9 Months Ended
	Feb. 02, 2016	Dec. 21, 2015	Nov. 04, 2015	Dec. 16, 2014	Dec. 31, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Acquisitions
Net sales						$ 375,240			$ 347,806		$ 1,055,077	$ 1,005,128
Net income						4,498			8,786		9,228	2,937
Amortization of purchased intangibles						9,666			6,606		24,620	21,035
Purchase price allocation
Goodwill						406,249				$ 406,249	406,249		$ 237,899
GATR
Acquisitions
Net sales						9,300				18,600
Net income						(8,200)					(20,600)
Compensation expense paid							$ 18,500
Compensation expense not expected to be deductible for tax purposes							$ 15,400
Amortization of purchased intangibles						3,600					6,000
Transaction and acquisition related costs											500
Change in fair value of contingent consideration						600					700
Cash consideration paid	$ 231,300
Contingent Amount	2,500
Additional cash consideration accelerated if certain event occurs	5,200
Cash paid related to compensation expenses	$ 17,700
Contingent consideration paid based upon contracts entered period	12 months
Purchase price allocation
Accounts receivable	$ 10,600
Inventory	3,400
Income tax receivable	5,500
Deferred tax liabilities	(22,200)
Accounts payable and accrued expenses	(2,400)
Other net liabilities assumed	(100)
Net identifiable assets acquired	66,500
Goodwill	154,700
Net assets acquired	$ 221,200
Weighted average useful life of intangible assets	9 years
Estimated amortization expense related to the intangible assets
2016						9,700				9,700	9,700
2017						12,700				12,700	12,700
2018						11,100				11,100	11,100
2019						9,800				9,800	9,800
2020						8,300				8,300	8,300
Thereafter						20,100				20,100	20,100
GATR | Maximum
Acquisitions
Contingent consideration paid based upon the value of contracts entered	$ 7,500
GATR | Customer relationships
Purchase price allocation
Amortizable intangible assets	51,700
GATR | Backlog
Purchase price allocation
Amortizable intangible assets	3,400
GATR | Technology
Purchase price allocation
Amortizable intangible assets	10,700
GATR | Non-compete agreements
Purchase price allocation
Amortizable intangible assets	1,200
GATR | Trade names
Purchase price allocation
Amortizable intangible assets	$ 4,700
TeraLogics
Acquisitions
Net sales						4,200					8,000
Net income						(200)					(1,400)
Compensation expense paid								$ 1,300
Amortization of purchased intangibles						1,000					2,000
Transaction and acquisition related costs								900			900
Cash consideration paid		$ 28,900
Contingent Amount		5,000
Fair value of consideration transferred		9,000
Purchase price allocation
Accounts receivable		1,400
Accounts payable and accrued expenses		(500)
Other net liabilities assumed		(100)
Net identifiable assets acquired		15,700
Goodwill		18,200
Net assets acquired		$ 33,900
Weighted average useful life of intangible assets		7 years
Estimated amortization expense related to the intangible assets
2016						3,000				3,000	3,000
2017						3,500				3,500	3,500
2018						2,800				2,800	2,800
2019						2,100				2,100	2,100
2020						1,400				1,400	1,400
Thereafter						2,100				2,100	2,100
TeraLogics | Maximum
Acquisitions
Additional cash consideration accelerated if certain event occurs		$ 6,000
Fair value of the potential customer		3,000
TeraLogics | Customer relationships
Purchase price allocation
Amortizable intangible assets		6,700
TeraLogics | Backlog
Purchase price allocation
Amortizable intangible assets		5,600
TeraLogics | Software
Purchase price allocation
Amortizable intangible assets		2,500
TeraLogics | Non-compete agreements
Purchase price allocation
Amortizable intangible assets		$ 100
H4 Global
Acquisitions
Net sales						800					1,400
Net income						100					100
Transaction and acquisition related costs								$ 100
Cash consideration paid			$ 900
Contingent Amount			1,000
Fair value of consideration transferred			$ 1,900
Contingent consideration paid based upon contracts entered period			5 years
Purchase price allocation
Goodwill			$ 1,900
H4 Global | Maximum
Acquisitions
Contingent consideration paid based upon the value of contracts entered			$ 4,100
DTECH
Acquisitions
Net sales						6,200			10,800		15,400	22,600
Net income						(400)			(200)		(4,000)	(2,000)
Amortization of purchased intangibles						1,900			$ 2,200		6,100	6,900
Transaction and acquisition related costs												$ 800
Cash consideration paid											96,300
Fair value of consideration transferred				$ 99,400
Additional cash consideration accelerated if certain event occurs				4,700
Fair value of the potential customer						4,400				4,400	4,400
Fair value of contingent consideration						400					2,300
Cost of acquisition net				99,500
Contingent consideration paid based upon the value of contracts entered					$ 5,000
Estimated fair value of the liability for contingent consideration				3,900		4,700				4,700	4,700
Fair value of additional cash consideration due to the seller, including the Holdback Consideration and contingent consideration						9,100				9,100	9,100
Purchase price allocation
Cash				900
Accounts receivable				5,400
Inventory				4,200
Warranty obligation				(400)
Deferred tax liabilities				(3,300)
Accounts payable and accrued expenses				(3,400)
Other net assets acquired				200
Net identifiable assets acquired				41,500
Goodwill				57,900
Net assets acquired				$ 99,400
Weighted average useful life of intangible assets				7 years
Estimated amortization expense related to the intangible assets
2016						8,000				8,000	8,000
2017						6,800				6,800	6,800
2018						5,500				5,500	5,500
2019						4,100				4,100	4,100
2020						2,800				2,800	2,800
Thereafter						$ 1,500				$ 1,500	$ 1,500
DTECH | Maximum
Acquisitions
Contingent Amount				$ 15,000
DTECH | Customer relationships
Purchase price allocation
Amortizable intangible assets				35,100
DTECH | Backlog
Purchase price allocation
Amortizable intangible assets				2,100
DTECH | Non-compete agreements
Purchase price allocation
Amortizable intangible assets				$ 700