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Commitments and Contingencies - Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2016 $ 5,350
2017 4,817
2018 4,234
2019 3,428
2020 3,123
Thereafter 11,711
Total $ 32,663