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Severance - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jun. 30, 2011
Restructuring And Related Activities [Abstract]  
Charges for severance for former employees $ 1.7
Severance charges related to accrued severance and benefits 1.3
Non-cash charges related to the vesting of certain unvested stock options and restricted common stock $ 0.4