Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Notice Of Proposed Adjustment One	Mar. 31, 2011 Notice Of Proposed Adjustment One	Mar. 31, 2010 Notice Of Proposed Adjustment One	Mar. 31, 2013 Notice Of Proposed Adjustment Two	Mar. 31, 2011 Notice Of Proposed Adjustment Two	Mar. 31, 2010 Notice Of Proposed Adjustment Two
Schedule Of Income Taxes [Line Items]
Adjustment to taxable income				$ 5,680,182	$ 4,981,520		$ 1,143,162	$ 1,553,984
Estimated income tax adjustment liable for taxes, penalties and interest, in aggregate for fiscal 2010 through 2013			13,300,000			1,100,000
Statutory federal rate	34.00%	34.00%
Income of foreign subsidiaries before taxes	$ 7,787,000	$ 4,908,000