Debt (Narratives) (Details) - USD ($)		3 Months Ended		6 Months Ended
	May 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Line Of Credit Facility [Line Items]
Outstanding letters of credit		$ 1,000,000		$ 1,000,000
Interest Expense
Line Of Credit Facility [Line Items]
Amortization of deferred financing costs		200,000	$ 200,000	300,000	$ 300,000
Credit Agreement
Line Of Credit Facility [Line Items]
Borrowings under Term Loan	$ 200,000,000
Credit Agreement | Term Loan
Line Of Credit Facility [Line Items]
Credit Facility, term	5 years
Amount borrowed under Term Loan	$ 190,000,000
Credit Agreement | Revolving Facility
Line Of Credit Facility [Line Items]
Credit Facility, term	5 years
Borrowing capacity from Credit Agreement	$ 40,000,000
Commitment fee	0.35%
Borrowings available under facility		$ 39,000,000		$ 39,000,000
Maximum | Credit Agreement
Line Of Credit Facility [Line Items]
Additional incremental loan facility	$ 100,000,000
Maximum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Line Of Credit Facility [Line Items]
Borrowings, interest rate	2.75%
Maximum | Credit Agreement | Adjusted Base Rate
Line Of Credit Facility [Line Items]
Borrowings, interest rate	1.75%
Maximum | Credit Agreement | Revolving Facility
Line Of Credit Facility [Line Items]
Commitment fee	0.40%
Minimum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Line Of Credit Facility [Line Items]
Borrowings, interest rate	1.50%
Minimum | Credit Agreement | Adjusted Base Rate
Line Of Credit Facility [Line Items]
Borrowings, interest rate	0.50%
Minimum | Credit Agreement | Revolving Facility
Line Of Credit Facility [Line Items]
Commitment fee	0.25%