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Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Dec. 31, 2018
Notes Tables |
Consolidated Stockholders' Equity Statement [Table Text Block] |
|  | Common Stock |  |  | Additional Paid-in |  |  | Retained |  |  | Accumulated Other Comprehensive |  |  |  |  |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Earnings |  |  | Income(Loss) |  |  | Total |
Balances at June 30, 2018 |  |  | 37,608 |  |  | $ | 376 |  |  | $ | 246,568 |  |  | $ | 876,931 |  |  | $ | (44,814 | ) |  | $ | 1,079,061 |
Cumulative effect adjustments due to adoption of new accounting standards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,780 |  |  |  | (24,682 | ) |  |  | 98 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,403 |  |  |  |  |  |  |  | 17,403 |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,136 | ) |  |  | (1,136 | )
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |
Surrender and retirement of stock to exercise options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |
Common stock issued for exercise of options |  |  | 166 |  |  |  | 2 |  |  |  | 15,609 |  |  |  |  |  |  |  |  |  |  |  | 15,611 |
Common stock issued for restricted stock awards |  |  | 24 |  |  |  | 0 |  |  |  |  |  |  |  | (1,909 | ) |  |  |  |  |  |  | (1,909 | )
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,066 | ) |  |  |  |  |  |  | (12,066 | )
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 11,327 |  |  |  |  |  |  |  |  |  |  |  | 11,327 |
Common stock issued to employee stock purchase plan |  |  | 5 |  |  |  | - |  |  |  | 842 |  |  |  |  |  |  |  |  |  |  |  | 842 |
Employee stock purchase plan expense |  |  |  |  |  |  |  |  |  |  | 238 |  |  |  |  |  |  |  |  |  |  |  | 238 |
Balances at September 30, 2018 |  |  | 37,803 |  |  | $ | 378 |  |  | $ | 274,584 |  |  | $ | 905,139 |  |  | $ | (70,632 | ) |  | $ | 1,109,469 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,556 |  |  |  |  |  |  |  | 17,556 |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,379 | ) |  |  | (12,379 | )
Share repurchases |  |  | (95 | ) |  |  | (1 | ) |  |  |  |  |  |  | (15,404 | ) |  |  |  |  |  |  | (15,404 | )
Surrender and retirement of stock to exercise options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |
Common stock issued for exercise of options |  |  | 24 |  |  |  | 0 |  |  |  | 2,408 |  |  |  |  |  |  |  |  |  |  |  | 2,408 |
Common stock issued for restricted stock awards |  |  | 3 |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | - |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,086 | ) |  |  |  |  |  |  | (12,086 | )
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 6,784 |  |  |  |  |  |  |  |  |  |  |  | 6,784 |
Common stock issued to employee stock purchase plan |  |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |
Employee stock purchase plan expense |  |  |  |  |  |  |  |  |  |  | 77 |  |  |  |  |  |  |  |  |  |  |  | 77 |
Balances at December 31, 2018 |  |  | 37,735 |  |  | $ | 377 |  |  | $ | 283,854 |  |  | $ | 895,205 |  |  | $ | (83,011 | ) |  | $ | 1,096,425 |
|  | Common Stock |  |  | Additional Paid-in |  |  | Retained |  |  | Accumulated Other Comprehensive |  |  |  |  |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Earnings |  |  | Income(Loss) |  |  | Total |
Balances at June 30, 2017 |  |  | 37,356 |  |  | $ | 374 |  |  | $ | 199,161 |  |  | $ | 799,027 |  |  | $ | (48,935 | ) |  | $ | 949,627 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,863 |  |  |  |  |  |  |  | 15,863 |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (824 | ) |  |  | (824 | )
Surrender and retirement of stock to exercise options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Common stock issued for exercise of options |  |  | 33 |  |  |  | 0 |  |  |  | 3,051 |  |  |  |  |  |  |  |  |  |  |  | 3,051 |
Common stock issued for restricted stock awards |  |  | 13 |  |  |  | 0 |  |  |  |  |  |  |  | (227 | ) |  |  |  |  |  |  | (227 | )
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,958 | ) |  |  |  |  |  |  | (11,958 | )
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 3,718 |  |  |  |  |  |  |  |  |  |  |  | 3,718 |
Common stock issued to employee stock purchase plan |  |  | 7 |  |  |  | 0 |  |  |  | 755 |  |  |  |  |  |  |  |  |  |  |  | 755 |
Employee stock purchase plan expense |  |  |  |  |  |  |  |  |  |  | 77 |  |  |  |  |  |  |  |  |  |  |  | 77 |
Balances at September 30, 2017 |  |  | 37,409 |  |  | $ | 374 |  |  | $ | 206,762 |  |  | $ | 802,705 |  |  | $ | (49,759 | ) |  | $ | 960,082 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,847 |  |  |  |  |  |  |  | 48,847 |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,058 | ) |  |  | (7,058 | )
Surrender and retirement of stock to exercise options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |
Common stock issued for exercise of options |  |  | 38 |  |  |  | 1 |  |  |  | 2,892 |  |  |  |  |  |  |  |  |  |  |  | 2,893 |
Common stock issued for restricted stock awards |  |  | 22 |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |
Cash dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,988 | ) |  |  |  |  |  |  | (11,988 | )
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 4,985 |  |  |  |  |  |  |  |  |  |  |  | 4,985 |
Common stock issued to employee stock purchase plan |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  | - |
Employee stock purchase plan expense |  |  |  |  |  |  |  |  |  |  | 59 |  |  |  |  |  |  |  |  |  |  |  | 59 |
Balances at December 31, 2017 |  |  | 37,470 |  |  | $ | 375 |  |  | $ | 214,697 |  |  | $ | 839,564 |  |  | $ | (56,817 | ) |  | $ | 997,819 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Gains |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  | (Losses) on |  |  | Foreign |  |  | Gains |  |  |  |  |
|  | Available- |  |  | Currency |  |  | (Losses) on |  |  |  |  |
|  | for-Sale |  |  | Translation |  |  | Derivatives |  |  |  |  |
|  | Investments |  |  | Adjustments |  |  | Instruments |  |  | Total |
Beginning balance as of June 30, 2018 |  | $ | 24,682 |  |  | $ | (69,496 | ) |  | $ | - |  |  | $ | (44,814 | )
Cumulative effect adjustment for adoption for ASU 2018-02 (1) |  |  | 2,371 |  |  |  | - |  |  |  | - |  |  |  | 2,371 |
Cumulative effect adjustment for adoption for ASU 2016-01 (1) |  |  | (27,053 | ) |  |  | - |  |  |  | - |  |  |  | (27,053 | )
Other comprehensive income (loss), net of tax benefit of $1,216 on derivative instruments (2) |  |  | - |  |  |  | (9,600 | ) |  |  | (3,915 | ) |  |  | (13,515 | )
Ending balance as of December 31, 2018 |  | $ | - |  |  | $ | (79,096 | ) |  | $ | (3,915 | ) |  | $ | (83,011 | )
|  | Unrealized |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Gains |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  | (Losses) on |  |  | Foreign |  |  | Gains |  |  |  |  |
|  | Available- |  |  | Currency |  |  | (Losses) on |  |  |  |  |
|  | for-Sale |  |  | Translation |  |  | Derivative |  |  |  |  |
|  | Investments |  |  | Adjustments |  |  | Instruments |  |  | Total |
Beginning balance as of June 30, 2017 |  | $ | 18,989 |  |  | $ | (67,924 | ) |  | $ | - |  |  | $ | (48,935 | )
Other comprehensive income (loss), net of tax benefit of $4,576 before reclassifications |  |  | (16,374 | ) |  |  | 8,492 |  |  |  | - |  |  |  | (7,882 | )
Ending balance as of December 31.2017 |  | $ | 2,615 |  |  |  | (59,432 | ) |  | $ | - |  |  | $ | (56,817 | )

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