Number of new stock issued during the period.

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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Condensed Consolidated Financial Statements, Basis of Presentation (Details) - Common Stock [Member] - shares	Oct. 31, 2018	May 02, 2018	Nov. 15, 2017	May 31, 2017	Mar. 31, 2019
Stock Issued or Granted During Period [Abstract]
Stock sold in initial public offering (in shares)				47,495,000
Kohlberg Kravis Roberts & Co. L.P [Member]
Stock Issued or Granted During Period [Abstract]
Stock sold in initial public offering (in shares)	20,000,000	30,533,478	25,300,000
Number of shares owned by non-controlling owners (in shares)					70,671,135
Ownership percentage by non-controlling owners					35.00%