Schedule of Authorized And Issued Common Stock And Preferred Stock (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Stockholders' Equity [Abstract]
Common stock shares authorized	125,000,000	125,000,000
Common stock par value	$ 0.10	$ 0.10
Common stock shares issued	49,485,832	51,250,995
Preferred stock shares authorized	3,000,000	3,000,000
Preferred stock par value	$ 0	$ 0
Preferred stock shares issued