Organization (Details) client in Thousands	3 Months Ended
Dec. 31, 2017 reportablesegment client	Dec. 31, 2017 category client	Dec. 31, 2017 client segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Minimum number of product categories offered (in categories) \| category		500
Number of clients \| client	10	10	10
Reportable segments (in segments)	3		3

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