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Earnings per share - Additional Information (Detail)	12 Months Ended
Earnings per share - Additional Information (Detail)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]
Number of potentially dilutive stock option shares excluded from the calculation of earnings per share	329,000	94,000	77,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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