Business Acquisitions (Narrative 1) (Details) (USD $)				0 Months Ended							0 Months Ended				0 Months Ended									3 Months Ended
	Sep. 30, 2012 Avaak Inc. [Member]	Jul. 03, 2012 Avaak Inc. [Member]	Jul. 03, 2012 Avaak Inc. [Member] In-Process Research and Development [Member]	Jul. 03, 2012 Avaak Inc. [Member] Technology [Member]	Jul. 03, 2012 Avaak Inc. [Member] Customer Relationships [Member]	Jul. 03, 2012 Avaak Inc. [Member] Trade Names and Trademarks [Member]	Jul. 03, 2012 Avaak Inc. [Member] US Federal [Member]	Jul. 03, 2012 Avaak Inc. [Member] State and Local Jurisdiction [Member]	Sep. 30, 2012 Firetide, Inc. [Member]	Jun. 04, 2012 Firetide, Inc. [Member]	Jun. 04, 2012 Firetide, Inc. [Member] Technology [Member]	Jun. 04, 2012 Firetide, Inc. [Member] US Federal [Member]	Jun. 04, 2012 Firetide, Inc. [Member] State and Local Jurisdiction [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member] Technology [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member] Customer Contracts And Related Relationships [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member] Order Backlog [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member] US Federal [Member]	Apr. 15, 2011 Westell Technologies, Inc. [Member] State and Local Jurisdiction [Member]	Jul. 03, 2011 Leaf Networks, LLC [Member]	Apr. 03, 2011 Leaf Networks, LLC [Member]	Mar. 28, 2010 Leaf Networks, LLC [Member]	Jan. 15, 2010 Leaf Networks, LLC [Member] Y	Sep. 30, 2012 Leaf Networks, LLC [Member] Technology [Member]	Sep. 30, 2012 Leaf Networks, LLC [Member] US Federal [Member]	Sep. 30, 2012 Leaf Networks, LLC [Member] State and Local Jurisdiction [Member]	Apr. 01, 2012 Leaf Networks, LLC [Member] Additional Payment [Member]	Apr. 03, 2011 Leaf Networks, LLC [Member] Additional Payment [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Aggregate purchase price		$ 24,004,000								$ 7,200,000				$ 37,009,000								$ 2,900,000	$ 2,100,000
Purchase price, cash paid	21,600,000								6,600,000											100,000	100,000	2,000,000					500,000	400,000
Total additional payout																							900,000
Total additional payout, period (in years)																							3
Present value of potential additional payments																						800,000
Acquired intangible assets										4,159,000				19,500,000	3,700,000	15,700,000	100,000					2,000,000		2,000,000
Deferred Tax Assets, Net		5,937,000
Business Acquisition, Purchase Price Allocation, Intangibles, Net		6,000,000	2,000,000	2,300,000	300,000	1,400,000
Goodwill		11,895,000								3,041,000				11,746,000								900,000
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount							0	0				1,700,000	3,000,000					10,400,000	11,600,000						500,000	900,000
Discount rate used to calculate present value of future cash flows ( in percentage)				14.00%	14.00%	16.00%					22.00%				16.00%	19.00%	3.30%
Acquired intangible assets, estimated useful life ( in years)				5 years	5 years	5 years					5 years				4 years	8 years								7 years
Business Acquisition Cost of Acquired Entity, Cash To Be Paid At Future Date	$ 2,400,000								$ 600,000