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Intangible Assets - Reconciliation of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ (192) $ (196)  
Net book value at end of period 1,713   $ 1,925
Patented Technologies [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount at beginning of period 39,710 41,689 41,689
Foreign currency translation adjustments (835)   (1,979)
Gross carrying amount at end of period 38,875   39,710
Accumulated amortization at beginning of period (37,785) $ (38,924) (38,924)
Amortization expense (192)   (770)
Foreign currency translation adjustments 815   1,909
Accumulated amortization at end of period (37,162)   (37,785)
Net book value at end of period $ 1,713   $ 1,925