Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Mar. 31, 2013
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	52,901,438	52,837,262
Common stock, shares outstanding	21,298,885	21,520,248
Treasury stock, shares	31,602,553	31,317,014