Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share - Additional Information (Detail)

v3.3.1.900
Basic and Diluted Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Oct. 31, 2015
Oct. 31, 2015
Restricted Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share, shares 0.5 0.5