Revenue Recognition (Detail Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 81,442	$ 94,228	$ 264,998	$ 227,591
Diluted earnings per share	$ 2.69	$ 2.56	$ 8.50	$ 9.88
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 6,300		$ 16,900
Diluted earnings per share	$ 0.18		$ 0.49
Revenue from previously satisfied performance obligations	$ 800		$ 1,100