Annual report pursuant to Section 13 and 15(d)

Earnings per share - Additional Information (Detail)

v2.4.0.6
Earnings per share - Additional Information (Detail)
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Earnings Per Share Disclosure [Line Items]      
Number of potentially dilutive stock option shares excluded from the calculation of earnings per share 94,000 77,000 70,000