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Intangible Assets - Reconciliation of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Sep. 30, 2014
Patented Technologies [Member]
Jun. 30, 2014
Patented Technologies [Member]
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount at beginning of period       $ 41,689 $ 38,941
Foreign currency translation adjustments       (1,191) 2,748
Gross carrying amount at end of period       40,498 41,689
Accumulated amortization at beginning of period       (38,924) (35,511)
Amortization expense (196) (192)   (196) (778)
Foreign currency translation adjustments       1,150 (2,635)
Accumulated amortization at end of period       (37,970) (38,924)
Net book value at end of period $ 2,528   $ 2,765 $ 2,528 $ 2,765