Revenue Recognition (Detail Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 99,589	$ 81,442	$ 278,408	$ 264,998
Diluted earnings per share	$ 3.16	$ 2.69	$ 8.94	$ 8.50
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 8,300	$ 6,300	$ 32,100	$ 16,900
Diluted earnings per share	$ 0.24	$ 0.18	$ 0.93	$ 0.49
Revenue from previously satisfied performance obligations	$ (300)	$ 800	$ 9,900	$ 1,100