Income Taxes Unrecognized Tax Benefit (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 1,003,000	$ 1,275,000	$ 958,000
Additions for tax positions taken in the current fiscal year	145,000	279,000	139,000
Additions for tax positions taken in prior fiscal years	7,000		178,000
Decreases for lapses in statutes of limitation	(75,000)	(551,000)
Unrecognized tax benefits, ending balance	1,080,000	1,003,000	1,275,000
Accrued tax penalties and interest related to unrecognized tax benefits	124,000	91,000
Tax penalties and interest related to unrecognized tax benefits recognized in current year tax provision	33,000	14,000	52,000
Minimum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Expected reduction in unrecognized tax benefit resulting from lapse of applicable statute of imitations expected in the next twelve months	0
Maximum
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Expected reduction in unrecognized tax benefit resulting from lapse of applicable statute of imitations expected in the next twelve months	$ 372,000