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Condensed Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] Cumulative Effect Of Change In Accounting Standards [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect Of Change In Accounting Standards [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Jun. 30, 2019 | $ 575 | $ 1,511,473 | $ (1,623,256) |  | $ 2,436,410 | $ (253,009) |  | $ 2,072,193
Beginning balance, shares at Jun. 30, 2019 | 185,491 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options |  | 5,609 |  |  |  |  |  | 5,609
Common stock issued on exercise of options, shares | 110 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax |  | (327) |  |  |  |  |  | (327)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 4 |  |  |  |  |  |  |
Stock-based compensation costs |  | 13,256 |  |  |  |  |  | 13,256
Other comprehensive income (loss) |  |  |  |  |  | (37,576) |  | (37,576)
Net income (loss) |  |  |  |  | 120,148 |  |  | 120,148
Dividends declared |  |  |  |  | (56,052) |  |  | (56,052)
Ending balance at Sep. 30, 2019 | $ 575 | 1,530,011 | $ (1,623,256) |  | 2,500,506 | (290,585) |  | 2,117,251
Ending balance, shares at Sep. 30, 2019 | 185,605 |  | (41,836) |  |  |  |  |
Beginning balance at Jun. 30, 2019 | $ 575 | 1,511,473 | $ (1,623,256) |  | 2,436,410 | (253,009) |  | 2,072,193
Beginning balance, shares at Jun. 30, 2019 | 185,491 |  | (41,836) |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 443,839
Ending balance at Mar. 31, 2020 | $ 579 | 1,533,905 | $ (1,623,256) |  | 2,711,639 | (366,436) |  | 2,256,431
Ending balance, shares at Mar. 31, 2020 | 186,499 |  | (41,836) |  |  |  |  |
Beginning balance at Sep. 30, 2019 | $ 575 | 1,530,011 | $ (1,623,256) |  | 2,500,506 | (290,585) |  | 2,117,251
Beginning balance, shares at Sep. 30, 2019 | 185,605 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options |  | 6,498 |  |  |  |  |  | 6,498
Common stock issued on exercise of options, shares | 117 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax | $ 3 | (40,764) |  |  |  |  |  | (40,761)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 576 |  |  |  |  |  |  |
Common stock issued on employee stock purchase plan |  | 12,190 |  |  |  |  |  | 12,190
Common stock issued on employee stock purchase plan, shares | 137 |  |  |  |  |  |  |
Stock-based compensation costs |  | 14,057 |  |  |  |  |  | 14,057
Other comprehensive income (loss) |  |  |  |  |  | 44,467 |  | 44,467
Net income (loss) |  |  |  |  | 160,554 |  |  | 160,554
Dividends declared |  |  |  |  | (56,150) |  |  | (56,150)
Ending balance at Dec. 31, 2019 | $ 578 | 1,521,992 | $ (1,623,256) |  | 2,604,910 | (246,118) |  | 2,258,106
Ending balance, shares at Dec. 31, 2019 | 186,435 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options | $ 1 | 1,815 |  |  |  |  |  | 1,816
Common stock issued on exercise of options, shares | 34 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax |  | (4,014) |  |  |  |  |  | (4,014)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 30 |  |  |  |  |  |  |
Stock-based compensation costs |  | 14,112 |  |  |  |  |  | 14,112
Other comprehensive income (loss) |  |  |  |  |  | (120,318) |  | (120,318)
Net income (loss) |  |  |  |  | 163,137 |  |  | 163,137
Dividends declared |  |  |  |  | (56,408) |  |  | (56,408)
Ending balance at Mar. 31, 2020 | $ 579 | 1,533,905 | $ (1,623,256) |  | 2,711,639 | (366,436) |  | 2,256,431
Ending balance, shares at Mar. 31, 2020 | 186,499 |  | (41,836) |  |  |  |  |
Beginning balance at Jun. 30, 2020 | $ 580 | 1,570,694 | $ (1,623,256) |  | 2,832,991 | (283,982) |  | 2,497,027
Beginning balance, shares at Jun. 30, 2020 | 186,723 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options |  | 1,026 |  |  |  |  |  | 1,026
Common stock issued on exercise of options, shares | 18 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax |  | 227 |  |  |  |  |  | 227
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 3 |  |  |  |  |  |  |
Stock-based compensation costs |  | 16,071 |  |  |  |  |  | 16,071
Other comprehensive income (loss) |  |  |  |  |  | 43,791 |  | 43,791
Net income (loss) |  |  |  |  | 178,372 |  |  | 178,372
Dividends declared |  |  |  |  | (56,511) |  |  | (56,511)
Ending balance at Sep. 30, 2020 | $ 580 | 1,588,018 | $ (1,623,256) | $ (1,143) | 2,953,709 | (240,191) | $ (1,143) | 2,678,860
Ending balance, shares at Sep. 30, 2020 | 186,744 |  | (41,836) |  |  |  |  |
Beginning balance at Jun. 30, 2020 | $ 580 | 1,570,694 | $ (1,623,256) |  | 2,832,991 | (283,982) |  | 2,497,027
Beginning balance, shares at Jun. 30, 2020 | 186,723 |  | (41,836) |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 279,405
Ending balance at Mar. 31, 2021 | $ 582 | 1,586,545 | $ (1,623,256) |  | 2,941,336 | (195,973) |  | 2,709,234
Ending balance, shares at Mar. 31, 2021 | 187,353 |  | (41,836) |  |  |  |  |
Beginning balance at Sep. 30, 2020 | $ 580 | 1,588,018 | $ (1,623,256) | $ (1,143) | 2,953,709 | (240,191) | $ (1,143) | 2,678,860
Beginning balance, shares at Sep. 30, 2020 | 186,744 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options |  | 1,857 |  |  |  |  |  | 1,857
Common stock issued on exercise of options, shares | 29 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax | $ 2 | (46,734) |  |  |  |  |  | (46,732)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 451 |  |  |  |  |  |  |
Common stock issued on employee stock purchase plan |  | 15,729 |  |  |  |  |  | 15,729
Common stock issued on employee stock purchase plan, shares | 116 |  |  |  |  |  |  |
Stock-based compensation costs |  | 15,370 |  |  |  |  |  | 15,370
Other comprehensive income (loss) |  |  |  |  |  | 77,040 |  | 77,040
Net income (loss) |  |  |  |  | 179,514 |  |  | 179,514
Dividends declared |  |  |  |  | (56,654) |  |  | (56,654)
Ending balance at Dec. 31, 2020 | $ 582 | 1,574,240 | $ (1,623,256) |  | 3,076,569 | (163,151) |  | 2,864,984
Ending balance, shares at Dec. 31, 2020 | 187,340 |  | (41,836) |  |  |  |  |
Common stock issued on exercise of options |  | 139 |  |  |  |  |  | 139
Common stock issued on exercise of options, shares | 1 |  |  |  |  |  |  |
Common stock issued on vesting of restricted stock units, net of shares withheld for tax |  | (3,431) |  |  |  |  |  | (3,431)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares | 12 |  |  |  |  |  |  |
Common stock issued on employee stock purchase plan |  | 6 |  |  |  |  |  | 6
Stock-based compensation costs |  | 15,591 |  |  |  |  |  | 15,591
Other comprehensive income (loss) |  |  |  |  |  | (32,822) |  | (32,822)
Net income (loss) |  |  |  |  | (78,481) |  |  | (78,481)
Dividends declared |  |  |  |  | (56,752) |  |  | (56,752)
Ending balance at Mar. 31, 2021 | $ 582 | $ 1,586,545 | $ (1,623,256) |  | $ 2,941,336 | $ (195,973) |  | $ 2,709,234
Ending balance, shares at Mar. 31, 2021 | 187,353 |  | (41,836) |  |  |  |  |

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