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Short-Term Borrowings and Long-Term Debt (Narrative) (Details)	12 Months Ended
	Jun. 30, 2018 USD ($) quarter	Jun. 30, 2017 USD ($)	Aug. 08, 2017 USD ($)	Aug. 03, 2017 USD ($)
Net debt issuance costs of credit facility and bonds	$ 1,300,000
Industrial Development Revenue Bond [Member]
Percentage spread points on variable rate debt instrument	0.85%
Maximum time period of interest (in years)	10 years
Debt instrument, exercisable option limitation, period	180 days
Debt instrument, anniversary, options exercisable, period	5 years
Debt instrument, redemption price, percentage	100.00%
Variable interest rate of debt	2.855%	1.926%
Multi-Currency Revolving Credit Facility [Member]
Borrowing capacity under credit facility			$ 300,000,000
Debt issuance costs of credit facility			300,000	$ 900,000
Debt instrument, covenant requirement, leverage ratio, EBITDA, number of quarters in measurement period | quarter	4
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Percentage of capital stock or other equity interest pledged per credit agreement	65.00%
Average daily balance on revolving credit facility	$ 269,500,000	$ 126,500,000
Amount available for additional borrowings	156,000,000	208,100,000
Letters of credit outstanding	$ 0	$ 0
Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]
Line of credit facility, unused capacity, commitment fee percentage	0.175%
Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]
Line of credit facility, unused capacity, commitment fee percentage	0.35%
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]
Borrowing capacity under credit facility			400,000,000
Letter of Credit [Member]
Borrowing capacity under credit facility			50,000,000
Multi-Currency Revolving Credit Facility, Accordion Feature [Member]
Borrowing capacity under credit facility			200,000,000
Multi-Currency Revolving Credit Facility, Combined with Accordion Feature [Member]
Borrowing capacity under credit facility			$ 600,000,000
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member]
Percentage spread points on variable rate debt instrument	1.625%
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]
Percentage spread points on variable rate debt instrument	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]
Percentage spread points on variable rate debt instrument	2.125%
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member]
Percentage spread points on variable rate debt instrument	0.625%
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member] | Minimum [Member]
Percentage spread points on variable rate debt instrument	0.00%
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]
Percentage spread points on variable rate debt instrument	1.125%

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