Commitments and Contingencies - Additional Information (Details) $ in Thousands	9 Months Ended	12 Months Ended
Mar. 31, 2020 USD ($) item	Jun. 30, 2019 USD ($)
Commitments And Contingencies [Line Items]
Number of potentially responsible parties \| item	140
Current And Long Term Liabilities
Commitments And Contingencies [Line Items]
Accrual for environmental loss contingencies payments \| $	$ 4,940	$ 5,890

Amount of cash outflow to settle environmental loss contingencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q1)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesPayments1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration