Debt (Narratives) (Details) - USD ($)		1 Months Ended	3 Months Ended
	Aug. 09, 2019	Oct. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	May 08, 2020
Line Of Credit Facility [Line Items]
Outstanding letters of credit			$ 7,700,000
Interest Expense
Line Of Credit Facility [Line Items]
Amortization of deferred financing costs			$ 800,000	$ 500,000
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			4.85%
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 | 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			$ 20,000,000.0
Line of credit facility intent to pay period			12 months
Borrowing capacity from Credit Agreement			$ 20,000,000.0
Line of credit outstanding, Current			$ 35,000,000.0
2019 Credit Agreement | Revolving Facility | Subsequent Event
Line Of Credit Facility [Line Items]
Repayments of Lines of Credit		$ 20,000,000.0
Line of credit facility remaining outstanding balance		$ 15,000,000.0
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 [Member]
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 | 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 | 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%