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Commitments and Contingencies - (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Loss Contingencies |  |
Rent free period (in months) | 8 months |
Rent expense | $ 0.9 | $ 0.6
Whitewood Media Village GP Limited and Whitewood Media Village Nominee Limited |  |
Loss Contingencies |  |
Lease term (in years) | 8 years |
Leasehold improvements | $ 2.5 |
The Mutual Insurance Society Limited |  |
Loss Contingencies |  |
Lease term (in years) | 15 years |
Operating lease |  |
Loss Contingencies |  |
Leasehold improvements | $ 0.1 | 2.1
Operating lease | Imperial (Forest House) Limited |  |
Loss Contingencies |  |
Lease term (in years) | 10 years |
Period to exercise option for additional space (in months) | 15 months |
Licensing agreements |  |
Loss Contingencies |  |
Loss Contingency Accrual | $ 0.7 | $ 0.0

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