CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 457,443	$ 321,480	$ 265,604
Other comprehensive income (loss):
Foreign currency translation adjustment	22,656	(4,990)	(6,103)
Effects of post-retirement adjustments, net of tax	585	141	(109)
Change in fair value of interest rate swap agreements, net of tax	12,753	(24,280)	(17,914)
Other comprehensive income (loss), net of tax	35,994	(29,129)	(24,126)
Comprehensive income	$ 493,437	$ 292,351	$ 241,478