Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income ("AOCI") by Component, Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,076,803	$ 1,133,209	$ 1,024,311
Other comprehensive income (loss) before reclassifications	86,013	(65,564)	(20,626)
Amounts reclassified from AOCI	15,637	2,402	185
Net current-period other comprehensive income	101,650	(63,162)	(20,441)
Ending Balance	3,406,170	2,076,803	1,133,209
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(87,383)	(24,221)	(3,780)
Ending Balance	14,267	(87,383)	(24,221)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(31,596)	(15,627)	(1,308)
Other comprehensive income (loss) before reclassifications	86,991	(15,969)	(14,319)
Amounts reclassified from AOCI	0	0	0
Net current-period other comprehensive income	86,991	(15,969)	(14,319)
Ending Balance	55,395	(31,596)	(15,627)
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(44,085)	0	0
Other comprehensive income (loss) before reclassifications	(2,687)	(46,067)	0
Amounts reclassified from AOCI	14,999	1,982	0
Net current-period other comprehensive income	12,312	(44,085)	0
Ending Balance	(31,773)	(44,085)	0
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(11,702)	(8,594)	(2,472)
Other comprehensive income (loss) before reclassifications	1,709	(3,528)	(6,307)
Amounts reclassified from AOCI	638	420	185
Net current-period other comprehensive income	2,347	(3,108)	(6,122)
Ending Balance	$ (9,355)	$ (11,702)	$ (8,594)