Acquisitions	12 Months Ended
Mar. 31, 2012
Business Combinations [Abstract]
Acquisitions	Acquisitions Fiscal 2012 During the fourth quarter of Fiscal 2012, the Company acquired InnerWireless, Inc. ("InnerWireless"), a privately-held company headquartered in Richardson, TX. InnerWireless is the first Black Box acquisition in the rapidly-growing in-building wireless market and services clients in every industry from healthcare to Fortune 500 enterprises. During the second quarter of Fiscal 2012, the Company acquired PS Technologies, LLC ("PS Tech"), a privately-held company headquartered in Dayton, OH. PS Tech is the first Black Box acquisition in the rapidly-growing enterprise video communications market and services clients in the healthcare and government verticals. The acquisition of InnerWireless and PS Tech, both individually and in the aggregate, did not have a material impact on the Company's consolidated financial statements. The fair values of assets acquired and liabilities assumed for InnerWireless and PS Tech are provisional and are based on the information that was available as of the acquisition date to estimate the fair value of assets acquired and liabilities assumed. The Company believes that the information available provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed but additional information not yet available is necessary to finalize those fair values. Thus, the provisional measurements of fair value are subject to change. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one-year from the acquisition date. Fiscal 2011 During the third quarter of Fiscal 2011, the Company acquired LOGOS Communications Systems, Inc. ("Logos"), a privately-held company headquartered in Westlake, OH. Logos has an active client base which includes commercial, education and various local government agency accounts. Also during the third quarter of Fiscal 2011, the Company acquired a non-controlling interest in Genesis Networks Integration Services, LLC, a new joint venture company which was formed in conjunction with Genesis Networks Enterprises, LLC ("Genesis"). This new joint venture company, based on Genesis’ existing Networks Integration Services Division, strengthens and enhances Genesis’ ability to deliver and support voice and data communications solutions to its enterprise clients. The Company believes that Genesis Networks Integration Services, LLC is a variable interest entity. However, the Company is not the primary beneficiary and thus it will account for its non-controlling interest under the equity method. The non-controlling interest is recorded as a long-term asset in Other assets within the Company’s Consolidated Balance Sheets and the net income (loss) attributable to the non-controlling interest is recorded in Other expenses (income), net within the Company’s Consolidated Statements of Operations. The acquisition of Logos and the non-controlling interest in Genesis Networks Integration Services, LLC, both individually and in the aggregate, did not have a material impact on the Company’s consolidated financial statements. Fiscal 2010 During the third quarter of Fiscal 2010, the Company acquired Quanta Systems, LLC ("Quanta"), a privately-held company headquartered in Gaithersburg, MD. Quanta has an active client base which includes various United States Department of Defense and government agency accounts. Also during the third quarter of Fiscal 2010, the Company acquired CBS Technologies Corp. ("CBS"), a privately-held company headquartered in Islandia, NY. CBS has an active client base which includes commercial, education and various government agency accounts. The acquisitions of Quanta and CBS, both individually and in the aggregate, did not have a material impact on the Company’s consolidated financial statements. The results of operations of InnerWireless, PS Tech, Logos, the non-controlling interest in Genesis Networks Integration Services, LLC, Quanta and CBS are included within the Company’s Consolidated Statements of Operations beginning on their respective acquisition dates. In connection with the acquisitions during Fiscal 2012, Fiscal 2011 and Fiscal 2010, the Company acquired approximately $22,622 of goodwill. The Company believes that $16,485 of such amount will be recognized as a tax deduction over the next 15 years.

Acquisitions

12 Months Ended

Mar. 31, 2012

Fiscal 2012

During the fourth quarter of Fiscal 2012, the Company acquired InnerWireless, Inc. ("InnerWireless"), a privately-held company headquartered in Richardson, TX. InnerWireless is the first Black Box acquisition in the rapidly-growing in-building wireless market and services clients in every industry from healthcare to Fortune 500 enterprises.

During the second quarter of Fiscal 2012, the Company acquired PS Technologies, LLC ("PS Tech"), a privately-held company headquartered in Dayton, OH. PS Tech is the first Black Box acquisition in the rapidly-growing enterprise video communications market and services clients in the healthcare and government verticals.

The acquisition of InnerWireless and PS Tech, both individually and in the aggregate, did not have a material impact on the Company's consolidated financial statements.

The fair values of assets acquired and liabilities assumed for InnerWireless and PS Tech are provisional and are based on the information that was available as of the acquisition date to estimate the fair value of assets acquired and liabilities assumed. The Company believes that the information available provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed but additional information not yet available is necessary to finalize those fair values. Thus, the provisional measurements of fair value are subject to change. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one-year from the acquisition date.

Fiscal 2011

During the third quarter of Fiscal 2011, the Company acquired LOGOS Communications Systems, Inc. ("Logos"), a privately-held company headquartered in Westlake, OH. Logos has an active client base which includes commercial, education and various local government agency accounts.

Also during the third quarter of Fiscal 2011, the Company acquired a non-controlling interest in Genesis Networks Integration Services, LLC, a new joint venture company which was formed in conjunction with Genesis Networks Enterprises, LLC ("Genesis"). This new joint venture company, based on Genesis’ existing Networks Integration Services Division, strengthens and enhances Genesis’ ability to deliver and support voice and data communications solutions to its enterprise clients.

The Company believes that Genesis Networks Integration Services, LLC is a variable interest entity. However, the Company is not the primary beneficiary and thus it will account for its non-controlling interest under the equity method. The non-controlling interest is recorded as a long-term asset in Other assets within the Company’s Consolidated Balance Sheets and the net income (loss) attributable to the non-controlling interest is recorded in Other expenses (income), net within the Company’s Consolidated Statements of Operations.

The acquisition of Logos and the non-controlling interest in Genesis Networks Integration Services, LLC, both individually and in the aggregate, did not have a material impact on the Company’s consolidated financial statements.

Fiscal 2010

During the third quarter of Fiscal 2010, the Company acquired Quanta Systems, LLC ("Quanta"), a privately-held company headquartered in Gaithersburg, MD. Quanta has an active client base which includes various United States Department of Defense and government agency accounts.

Also during the third quarter of Fiscal 2010, the Company acquired CBS Technologies Corp. ("CBS"), a privately-held company headquartered in Islandia, NY. CBS has an active client base which includes commercial, education and various government agency accounts.

The acquisitions of Quanta and CBS, both individually and in the aggregate, did not have a material impact on the Company’s consolidated financial statements.

The results of operations of InnerWireless, PS Tech, Logos, the non-controlling interest in Genesis Networks Integration Services, LLC, Quanta and CBS are included within the Company’s Consolidated Statements of Operations beginning on their respective acquisition dates.

In connection with the acquisitions during Fiscal 2012, Fiscal 2011 and Fiscal 2010, the Company acquired approximately $22,622 of goodwill. The Company believes that $16,485 of such amount will be recognized as a tax deduction over the next 15 years.