CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)	$ 0.01
Beginning balance at Jun. 30, 2017	$ 1,712,832	$ 1,080	$ 1,137,724	$ 868,822	$ (99,315)	$ (195,479)
Beginning balance, shares at Jun. 30, 2017		107,989			4,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	9,694			9,694
Other comprehensive income (loss)	11,239					11,239
Issuance of common stock pursuant to stock-based compensation plans	0	$ 4	(4)
Issuance of common stock pursuant to compensation plans, shares		433
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(7,192)				$ (7,192)
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans, shares					183
Stock-based compensation expense	10,476		10,476
Ending balance at Jun. 30, 2018	$ 1,737,049	$ 1,084	1,148,196	878,516	$ (106,507)	(184,240)
Ending balance, shares at Jun. 30, 2018		108,422			4,470
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)	$ 0.01
Net (loss) income	$ (183,314)			(183,314)
Other comprehensive income (loss)	(41,112)					(41,112)
Issuance of common stock pursuant to stock-based compensation plans	0	$ 4	(4)
Issuance of common stock pursuant to compensation plans, shares		411
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(3,532)				$ (3,532)
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans, shares					144
Stock-based compensation expense	10,065		10,065
Ending balance at Jun. 30, 2019	$ 1,519,319	$ 1,088	1,158,257	695,017	$ (110,039)	(225,004)
Ending balance, shares at Jun. 30, 2019	108,833	108,833			4,614
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)	$ 0.01
Net (loss) income	$ (80,407)			(80,407)
Other comprehensive income (loss)	53,612					53,612
Issuance of common stock pursuant to stock-based compensation plans	0	$ 4	(4)
Issuance of common stock pursuant to compensation plans, shares		290
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans	(1,931)				$ (1,931)
Shares withheld for payment of employee payroll taxes due on shares issued under stock-based compensation plans, shares					73
Repurchases of common stock	(60,222)				$ (60,222)
Repurchases of common stock, shares					2,551
Stock-based compensation expense	13,622		13,622
Ending balance at Jun. 30, 2020	$ 1,443,554	$ 1,092	$ 1,171,875	$ 614,171	$ (172,192)	$ (171,392)
Ending balance, shares at Jun. 30, 2020	109,123	109,123			7,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)	$ 0.01