Consolidated Statement Of Stockholders' Equity (Unaudited) - 3 months ended Sep. 30, 2017 - 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	$ 19,846			19,846
Other comprehensive income (loss)	33,787					33,787
Issuance of common stock pursuant to stock based compensation plans	0	$ 1	(1)
Issuance of common stock pursuant to stock based compensation plans, shares		98
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans	(2,098)				$ (2,098)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans, shares					52
Stock-based compensation expense	3,164		3,164
Balance at Sep. 30, 2017	$ 1,767,531	$ 1,081	$ 1,140,887	$ 888,668	$ (101,413)	$ (161,692)
Balance, shares at Sep. 30, 2017	108,087	108,087			4,339