Revenue Recognition (Detail Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 95,473	$ 92,842	$ 178,819	$ 183,556
Diluted earnings per share	$ 3.11	$ 2.71	$ 5.78	$ 5.81
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 17,200	$ 4,200	$ 23,800	$ 10,600
Diluted earnings per share	$ 500,000	$ 120,000	$ 690,000	$ 310,000
Revenue from previously satisfied performance obligations	$ 9,800		$ 10,200