Consolidated Statement Of Stockholders' Equity (Unaudited) - 9 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Jun. 30, 2017	$ 1,712,832	$ 1,080	$ 1,137,724	$ 868,822	$ (99,315)	$ (195,479)
Balance, shares at Jun. 30, 2017	107,989	107,989			4,287
Increase (Decrease) in Stockholders' Equity
Net income	$ 79,635			79,635
Other comprehensive income (loss)	79,895					79,895
Issuance of common stock pursuant to stock-based compensation plans	0	$ 4	(4)
Issuance of common stock pursuant to stock-based compensation plans, shares		394
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(6,853)				$ (6,853)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans, shares					171
Stock-based compensation expense	10,258		10,258
Balance at Mar. 31, 2018	$ 1,875,767	$ 1,084	$ 1,147,978	$ 948,457	$ (106,168)	$ (115,584)
Balance, shares at Mar. 31, 2018	108,383	108,383			4,458