Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Additional Information (Detail)

v2.4.0.6
Earnings Per Share - Additional Information (Detail)
3 Months Ended 1 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Mar. 31, 2012
2% Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities-equity based compensation plans (excluded from earnings per share calculation) 789,000 3,856,000  
Number of shares issued due to calling of convertible notes     5,951,440