Revenue Recognition (Detail Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 132,452	$ 95,473	$ 256,896	$ 178,819
Diluted earnings per share	$ 4.18	$ 3.11	$ 7.86	$ 5.78
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 18,100	$ 17,200	$ 25,900	$ 23,800
Diluted earnings per share	$ 0.53	$ 0.50	$ 0.75	$ 0.69
Revenue from previously satisfied performance obligations	$ 1,200	$ 9,800	$ 1,600	$ 10,200