Commitments and Contingencies - Change in Control Agreements (Details) - CIC Agreements - employee	12 Months Ended
Sep. 30, 2016	Sep. 30, 2014
Loss Contingencies [Line Items]
Period of the change in control	18 months
CIC Recipients
Loss Contingencies [Line Items]
Number of key employees		22

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.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration