Net Income or Loss Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Dec. 31, 2012 Performance Shares	Dec. 31, 2011 Performance Shares	Dec. 31, 2012 Performance Shares	Dec. 31, 2011 Stock Options	Dec. 31, 2011 Restricted Stock
Earnings Per Share Disclosure [Line Items]
Shares excluded from the calculation of diluted weighted average shares outstanding	908,000	391,000	562,000	4,544,000	867,000