Fair Value of Financial Instruments (Schedule of Remaining Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Assets:
Deferred compensation plan investments, current and non-current portion	$ 28,687	$ 27,159
Total assets at fair value	28,687	27,159
Liabilities:
Deferred compensation plan investments, current and non-current portion	28,687	27,159
Liability for contingent consideration	46,850	46,334
Total liabilities at fair value	84,810	82,952
Quoted prices in active markets (Level 1)
Assets:
Deferred compensation plan investments, current and non-current portion	28,687	27,159
Total assets at fair value	28,687	27,159
Liabilities:
Deferred compensation plan investments, current and non-current portion	28,687	27,159
Liability for contingent consideration	0	0
Total liabilities at fair value	28,687	27,159
Significant other observable inputs (Level 2)
Assets:
Deferred compensation plan investments, current and non-current portion	0	0
Total assets at fair value	0	0
Liabilities:
Deferred compensation plan investments, current and non-current portion	0	0
Liability for contingent consideration	0	0
Total liabilities at fair value	9,273	9,459
Significant unobservable inputs (Level 3)
Assets:
Deferred compensation plan investments, current and non-current portion	0	0
Total assets at fair value	0	0
Liabilities:
Deferred compensation plan investments, current and non-current portion	0	0
Liability for contingent consideration	46,850	46,334
Total liabilities at fair value	46,850	46,334
Foreign exchange contracts
Liabilities:
Derivative liability	41	26
Foreign exchange contracts | Quoted prices in active markets (Level 1)
Liabilities:
Derivative liability	0	0
Foreign exchange contracts | Significant other observable inputs (Level 2)
Liabilities:
Derivative liability	41	26
Foreign exchange contracts | Significant unobservable inputs (Level 3)
Liabilities:
Derivative liability	0	0
Interest rate swap agreement
Liabilities:
Derivative liability	9,232	9,433
Interest rate swap agreement | Quoted prices in active markets (Level 1)
Liabilities:
Derivative liability	0	0
Interest rate swap agreement | Significant other observable inputs (Level 2)
Liabilities:
Derivative liability	9,232	9,433
Interest rate swap agreement | Significant unobservable inputs (Level 3)
Liabilities:
Derivative liability	$ 0	$ 0