Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful debts, accounts receivable	$ 1,745,000	$ 2,295,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	53,126,866	52,837,262
Common stock, shares outstanding	20,979,392	21,520,248
Treasury stock, shares	32,147,474	31,317,014