Debt and Credit Facilities Credit Facility (Details)		9 Months Ended
	Apr. 15, 2021	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Apr. 15, 2016 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Apr. 15, 2021
Debt Issuance Costs, Noncurrent, Net		$ 262,000		$ 511,000
Loss on extinguishment of debt		(18,656,000)	$ (910,000)
Other Borrowings		230,000,000.0
Pledged Financial Instruments, Not Separately Reported, Securities for Letter of Credit Facilities		25,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		240,000,000.0			$ 242,500,000
Letters of Credit Outstanding, Amount		$ 2,500,000
Banking Regulation, Supplementary Leverage Ratio, Undercapitalized, Minimum		4.00
Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.68%
Minimum | London Interbank Offered Rate [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Minimum | Base Rate [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Maximum | London Interbank Offered Rate [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Maximum | Base Rate [Member] | Revolving Credit Facility Due April Fifteenth Twenty Twenty One [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.75%