Segment Information - Narrative (Details) - 3 months ended Dec. 31, 2017	reportablesegment	Total	segment
Segment Reporting [Abstract]
Reportable segments (in segments)	3		3
Segments percentage of revenue (as a percentage)		97.00%

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration