Debt (Narratives) (Details) - USD ($)		3 Months Ended		6 Months Ended	9 Months Ended
	Aug. 09, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Nov. 03, 2020	Jun. 30, 2020	May 08, 2020
Line Of Credit Facility [Line Items]
Outstanding letters of credit		$ 14,800,000			$ 14,800,000
Interest Expense
Line Of Credit Facility [Line Items]
Amortization of deferred financing costs		700,000	$ 600,000		$ 2,300,000	$ 1,800,000
2019 Credit Agreement
Line Of Credit Facility [Line Items]
Deferred financing cost								$ 10,500,000
Amortization of deferred financing costs	$ 1,600,000
Debt instrument interest rate					4.60%
2019 Credit Agreement | First Amendment
Line Of Credit Facility [Line Items]
Amendment start date					Apr. 08, 2020
2019 Credit Agreement | Second Amendment
Line Of Credit Facility [Line Items]
Amendment start date					May 08, 2020
2019 Credit Agreement | Third Amendment
Line Of Credit Facility [Line Items]
Amendment start date					Nov. 03, 2020
Line of credit sublimit for letters of credit							$ 20,000,000.0
2019 Credit Agreement | Fourth Amendment
Line Of Credit Facility [Line Items]
Amendment start date					Dec. 08, 2020
2019 Credit Agreement | Term Loan
Line Of Credit Facility [Line Items]
Credit Facility, term	5 years
Borrowing capacity from Credit Agreement	$ 380,000,000
2019 Credit Agreement | Revolving Facility
Line Of Credit Facility [Line Items]
Credit Facility, term	5 years
Borrowing capacity from Credit Agreement	$ 75,000,000			$ 55,000,000.0
Repayments of Lines of Credit				$ 55,000,000.0
Line of credit facility remaining outstanding balance		0			$ 0
Borrowing capacity from Credit Agreement		$ 55,000,000.0			$ 55,000,000.0
2019 Credit Agreement | Revolving Facility | Second Amendment
Line Of Credit Facility [Line Items]
Borrowing capacity from Credit Agreement									$ 55,000,000.0
2019 Credit Agreement | Revolving Facility | Applicable Margin for Eurodollar | Second Amendment
Line Of Credit Facility [Line Items]
Euro dollar rate									4.50%
Initial Term Loan | Revolving Facility
Line Of Credit Facility [Line Items]
Base rate	0.00%
Commitment fee	0.40%
Amendments
Line Of Credit Facility [Line Items]
Deferred financing cost								$ 1,500,000
Maximum | 2019 Credit Agreement
Line Of Credit Facility [Line Items]
Additional incremental loan facility that may be requested	$ 100,000,000
Maximum | 2019 Credit Agreement | Applicable Margin for Eurodollar | Second Amendment
Line Of Credit Facility [Line Items]
Commitment fee					0.40%
Suspension period rate					4.50%
Maximum | Initial Term Loan | Applicable Margin for Eurodollar
Line Of Credit Facility [Line Items]
Borrowings, interest rate	3.50%
Maximum | Initial Term Loan | Applicable Margin for Base Rate
Line Of Credit Facility [Line Items]
Borrowings, interest rate	2.50%
Maximum | Initial Term Loan | Revolving Facility
Line Of Credit Facility [Line Items]
Commitment fee	0.40%
Minimum | 2019 Credit Agreement | Applicable Margin for Eurodollar | Second Amendment
Line Of Credit Facility [Line Items]
Commitment fee					0.35%
Ongoing rate					2.75%
Minimum | Initial Term Loan | Applicable Margin for Eurodollar
Line Of Credit Facility [Line Items]
Borrowings, interest rate	1.25%
Minimum | Initial Term Loan | Applicable Margin for Base Rate
Line Of Credit Facility [Line Items]
Borrowings, interest rate	0.25%
Minimum | Initial Term Loan | Revolving Facility
Line Of Credit Facility [Line Items]
Commitment fee	0.25%