Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Net of Tax	$ 1,310,421	$ 1,391,530
Retained earnings	1,947,498	2,027,263	$ 1,927,568
Balance at the end of period - Net of Tax	1,330,971	1,327,193
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Net of Tax	(9,055)	(137,290)
Balance at the end of period - Net of Tax	(8,612)	(176,739)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Net of Tax	(1,383)	(137,389)
Other comprehensive income (loss) - Gross	318	(39,494)
Balance at the end of period - Net of Tax	(1,065)	(176,883)
Marketable Securities.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Gross	242	131
Balance at the beginning of period - Tax	(59)	(32)
Balance at the beginning of period - Net of Tax	183	99
Other comprehensive income (loss) - Gross	(2)	59
Other comprehensive income (loss) - Tax	1	(14)
Balance at the end of period - Net of Tax	182	$ 144
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Gross	(10,399)
Balance at the beginning of period - Tax	2,544
Balance at the beginning of period - Net of Tax	(7,855)
Other comprehensive income (loss) - Gross	167
Other comprehensive income (loss) - Tax	(41)
Balance at the end of period - Net of Tax	$ (7,729)