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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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- Definition

Lessee, Operating Lease, Period to Exercise Option for Additional Space

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Lessee, Operating Lease, Rent Free Period

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 45
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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of loss contingency liability.

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