Consolidated Statement Of Stockholders' Equity (Unaudited) - 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]
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of ASU | ASU 2016-01 [Member]	$ 0			$ (348)		$ 348
Cumulative effect of adoption of ASU | ASU 2014-09 [Member]	163			163
Balance at Jun. 30, 2018	$ 1,737,049	$ 1,084	$ 1,148,196	878,516	$ (106,507)	(184,240)
Balance, shares at Jun. 30, 2018	108,422	108,422			4,470
Increase (Decrease) in Stockholders' Equity
Net income	$ (37,425)			(37,425)
Other comprehensive loss	(13,519)					(13,519)
Issuance of common stock pursuant to stock-based compensation plans	0	$ 1	(1)
Issuance of common stock pursuant to stock-based compensation plans, shares		85
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(979)				$ (979)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans, shares					35
Stock-based compensation expense	135		135
Balance at Sep. 30, 2018	$ 1,685,424	$ 1,085	$ 1,148,330	$ 840,906	$ (107,486)	$ (197,411)
Balance, shares at Sep. 30, 2018	108,507	108,507			4,505