Commitments and Contingencies (Loss Contingencies) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 50.7
Total liquidated damages
Loss Contingencies [Line Items]
Estimated Litigation Liability	46.0
Other costs associated with the settlement
Loss Contingencies [Line Items]
Estimated Litigation Liability	4.7
Liquidated damages for contract years ending July 31, 2018 and July 31, 2019
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 14.2

Carrying amount of estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid after one year or beyond the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LitigationReserveNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant