Summary of Significant Accounting Policies (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jun. 30, 2011
Summary of Significant Accounting Policies (Textuals) [Abstract]
Maturity Period of Cash and Cash Equivalents	90 days or less
Contractual term of ARS	30 years
Interest Rate Reset Dates	7, 28 or 35 days
Unrealized losses on marketable securities	$ 10
Management Forecast Period	5 years
Discount rate based on marketplace participant expectations	15.0%-19.0%
Debt-free net cash flow long-term growth rate	3.00%
Debt-free net cash flow long-term growth rate maximum	5.00%
Estimate of Future Cash Flow Period	5 and 10 year
Risk Adjusted Discount Rate of Cash Flows	10 and 25 percent
Useful lives of intangible assets, Minimum	3
Useful lives of intangible assets, Maximum	9
Impairment of goodwill	$ 0
Computers and Electronic Test Equipment [Member]
Summary of Significant Accounting Policies (Textuals) [Abstract]
Useful lives	3-5 years
Furniture and Fixtures [Member]
Summary of Significant Accounting Policies (Textuals) [Abstract]
Useful lives	5-7 years
Leasehold Improvements [Member]
Summary of Significant Accounting Policies (Textuals) [Abstract]
Useful lives	lesser of lease term or estimated useful life of asset
Internal Use Software [Member]
Summary of Significant Accounting Policies (Textuals) [Abstract]
Useful lives of software developed (in years)	7
External Use Software [Member]
Summary of Significant Accounting Policies (Textuals) [Abstract]
Useful lives of software developed (in years)	3

Auction Rate Securities Contractual Term.

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Cash And Cash Equivalents Maturity Period.

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Debt-free net cash flow long-term growth rate.

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Debt Free Net Cash Flow Long Term Growth Rate.

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Discount rate based on marketplace participant expectations.

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Estimate of Future Cash Flow Period.

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Interest Rate Reset Dates.

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Management Forecast Period.

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Risk Adjusted Discount Rate of Cash Flows.

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Summary of Significant Accounting Policies.

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Unrealized loss on marketable securities, net of tax.

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The useful life of all finite-lived intangible assets. This may be stated as a fixed number (for example, 10 years) if all assets have the same useful life, or it can be stated in a range (for example, six to eight years) if there is a range of useful lives in the asset group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 20

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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