Consolidated Statement Of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Effect of Adoption [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Effect of Adoption [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Other Comprehensive (Loss) Income [Member] Effect of Adoption [Member]
Balance at Jun. 30, 2018	$ 1,737,049		$ 1,084	$ 1,148,196	$ 878,516		$ (106,507)	$ (184,240)
Balance (ASU 2016-01 [Member]) at Jun. 30, 2018		$ 0				$ (348)			$ 348
Balance (ASU 2014-09 [Member]) at Jun. 30, 2018		163				163
Balance (shares) at Jun. 30, 2018			108,422				4,470
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(37,425)				(37,425)
Other comprehensive income (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				4,505
Balance at Jun. 30, 2018	1,737,049		$ 1,084	1,148,196	878,516		$ (106,507)	(184,240)
Balance (ASU 2016-01 [Member]) at Jun. 30, 2018		0				(348)			$ 348
Balance (ASU 2014-09 [Member]) at Jun. 30, 2018		163				163
Balance (shares) at Jun. 30, 2018			108,422				4,470
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(169,763)
Balance at Mar. 31, 2019	1,549,792		$ 1,087	1,154,182	708,568		$ (109,578)	(204,467)
Balance (shares) at Mar. 31, 2019			108,713				4,592
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				4,505
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(66,501)				(66,501)
Other comprehensive income (loss)	(27,948)							(27,948)
Issuance of common stock pursuant to stock-based compensation plans	0		$ 2	(2)
Issuance of common stock pursuant to stock-based compensation plans (shares)			184
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(1,943)						$ (1,943)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans (shares)							79
Stock-based compensation expense	1,911			1,911
Balance at Dec. 31, 2018	1,590,943		$ 1,087	1,150,239	774,405		$ (109,429)	(225,359)
Balance (shares) at Dec. 31, 2018			108,691				4,584
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(65,837)				(65,837)
Other comprehensive income (loss)	20,892							20,892
Issuance of common stock pursuant to stock-based compensation plans	0		$ 0	0
Issuance of common stock pursuant to stock-based compensation plans (shares)			22
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(149)						$ (149)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans (shares)							8
Stock-based compensation expense	3,943			3,943
Balance at Mar. 31, 2019	1,549,792		$ 1,087	1,154,182	708,568		$ (109,578)	(204,467)
Balance (shares) at Mar. 31, 2019			108,713				4,592
Balance at Jun. 30, 2019	$ 1,519,319		$ 1,088	1,158,257	695,017		$ (110,039)	(225,004)
Balance (ASU 2016-02 [Member]) at Jun. 30, 2019		(439)				(439)
Balance (shares) at Jun. 30, 2019	108,833		108,833				4,614
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ (107,021)				(107,021)
Other comprehensive income (loss)	56,110							56,110
Issuance of common stock pursuant to stock-based compensation plans	0		$ 1	(1)
Issuance of common stock pursuant to stock-based compensation plans (shares)			40
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(312)						$ (312)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans (shares)							17
Stock-based compensation expense	3,281			3,281
Balance at Sep. 30, 2019	1,470,938		$ 1,089	1,161,537	587,557		$ (110,351)	(168,894)
Balance (shares) at Sep. 30, 2019			108,873				4,631
Balance at Jun. 30, 2019	$ 1,519,319		$ 1,088	1,158,257	695,017		$ (110,039)	(225,004)
Balance (ASU 2016-02 [Member]) at Jun. 30, 2019		(439)				(439)
Balance (shares) at Jun. 30, 2019	108,833		108,833				4,614
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ (83,646)
Balance at Mar. 31, 2020	$ 1,439,048		$ 1,092	1,168,378	610,932		$ (168,951)	(172,403)
Balance (shares) at Mar. 31, 2020	109,089		109,089				7,117
Balance at Sep. 30, 2019	$ 1,470,938		$ 1,089	1,161,537	587,557		$ (110,351)	(168,894)
Balance (shares) at Sep. 30, 2019			108,873				4,631
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(964)				(964)
Other comprehensive income (loss)	48,697							48,697
Issuance of common stock pursuant to stock-based compensation plans	0		$ 2	(2)
Issuance of common stock pursuant to stock-based compensation plans (shares)			146
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(671)						$ (671)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans (shares)							27
Stock-based compensation expense	3,083			3,083
Balance at Dec. 31, 2019	1,521,083		$ 1,091	1,164,618	586,593		$ (111,022)	(120,197)
Balance (ASU 2016-02 [Member]) at Dec. 31, 2019		$ 0				$ 0
Balance (shares) at Dec. 31, 2019			109,019				4,658
Increase (Decrease) in Stockholders' Equity
Net income (loss)	24,339				24,339
Other comprehensive income (loss)	(52,206)							(52,206)
Issuance of common stock pursuant to stock-based compensation plans	0		$ 1	(1)
Issuance of common stock pursuant to stock-based compensation plans (shares)			70
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(523)						$ (523)
Shares withheld for payment of employee payroll taxes due on shares issued under stock based compensation plans (shares)							20
Repurchases of common stock							$ (57,406)
Repurchases of common stock (shares)							2,439
Stock-based compensation expense	3,761			3,761
Balance at Mar. 31, 2020	$ 1,439,048		$ 1,092	$ 1,168,378	$ 610,932		$ (168,951)	$ (172,403)
Balance (shares) at Mar. 31, 2020	109,089		109,089				7,117