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Income Taxes - Reconciliation of income tax provision computed at the U.S. federal statutory tax rates to income tax expense (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax Disclosure [Abstract]
Income taxes at U.S. statutory rates	$ 9,557	$ 9,230	$ 11,647
State income taxes, net of federal tax benefit	562	540	714
Permanent differences	(74)	(68)	(64)
Other	96	10	109
Total provision for income taxes	$ 10,141	$ 9,712	$ 12,406

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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