Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

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

Related Party Transactions and Former Parent Company Investment (Details) $ in Millions		1 Months Ended	9 Months Ended
	Mar. 31, 2017 segment	Dec. 31, 2015 USD ($)	Jul. 31, 2017
Related Party Transactions [Abstract]
General period for obligations under service and commercial contracts			5 years
Related Party Transaction [Line Items]
Number of operating segments \| segment	5
Former Parent Company of reporting entity
Related Party Transaction [Line Items]
Net cash allocation from former Parent \| $		$ 526