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Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]    
Change in unrealized gains (losses) on available-for-sale securities (net of tax)   $ 30
Foreign currency translation adjustments (775) (255)
Total $ (775) $ (225)