Revenue - Additional Information (Details)	6 Months Ended
Mar. 31, 2019
Revenue Recognition [Line Items]
Remaining performance obligation, practical expedient	true
Maximum
Revenue Recognition [Line Items]
Revenue remaining performance obligation original excepted duration	1 year

Remaining duration of performance obligation for which optional exemption was applied not to disclose amount of transaction price allocated to and timing of revenue recognition for remaining performance obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130558-203045

Name:	us-gaap_RevenueRemainingPerformanceObligationOptionalExemptionRemainingDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant