Summary of Significant Accounting Policies - Insurance Recovery (Details) $ in Millions	3 Months Ended
Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies
Gain due to insurance proceeds received	$ 4.8
Gain recorded as reduction in SG&A	1.6
Gain recorded as reduction in cost of services expense	$ 3.2

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114868897&loc=SL114872001-224240

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration