Certain Financial Statement Information (Details 11) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Schedule of cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity
Less than 1 year, Cost	$ 7,497	$ 9,205
Mature in 1 - 2 years, Cost	17,140	19,843
Mature in 3 - 5 years, Cost	170	1,575
Mature after 5 years, Cost	2,644	962
Cost, Total	27,451	31,585
Less than 1 year, Fair Value	7,508	9,217
Mature in 1 - 2 years, Fair Value	17,147	20,040
Mature in 3 - 5 years, Fair Value	171	1,649
Mature after 5 years, Fair Value	2,990	1,098
Fair Value, Total	$ 27,816	$ 32,004

Available-for-sale securities, debt maturities, after five years, amortized cost.

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Available-for-sale securities, debt maturities, after five years, fair value.

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Available-for-sale securities, debt maturities, one to two years, amortized cost.

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Available-for-sale securities, debt maturities, three to five years, amortized cost.

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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