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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation and Transactions, Earnings per Share, Warranty Provision, Income Taxes & Leases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2018 | Jul. 01, 2018 | Feb. 28, 2017
Foreign Currency Translation |  |  |  |  |  |
Transaction gain (loss) | $ 100 | $ (1,300) | $ 2,000 |  |  |
Earnings (loss) per share: |  |  |  |  |  |
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands) | 40 | 1,280 | 87 |  |  |
Computation of basic and diluted earnings per share |  |  |  |  |  |
Net income | $ 64,796 | $ (29,127) | $ 21,076 |  |  |
Weighted average shares outstanding-basic | 18,097 | 18,592 | 18,894 |  |  |
Dilutive effect of equity awards | 623 |  | 795 |  |  |
Weighted average shares outstanding-diluted | 18,720 | 18,592 | 19,689 |  |  |
Basic earnings (loss) per share | $ 3.58 | $ (1.57) | $ 1.12 |  |  |
Diluted earnings (loss) per share | $ 3.46 | $ (1.57) | $ 1.07 |  |  |
Weighted average shares excluded from diluted earnings (loss) per share due to their anti-dilutive effect (in thousands) | 40 | 1,280 | 87 |  |  |
Changes in warranty provision |  |  |  |  |  |
Warranty provision at beginning of period | $ 21,819 | $ 15,178 | $ 15,948 |  |  |
Warranty claims provided for/assumed in acquisition | 8,867 | 14,156 | 5,793 |  |  |
Settlements made | (8,962) | (7,515) | (6,563) |  |  |
Warranty provision at end of period | 21,724 | 21,819 | $ 15,178 |  |  |
Recently Adopted Accounting Pronouncements |  |  |  |  |  |
Prepaid expenses and other assets | 32,432 | 41,587 |  |  |  |
Deferred tax asset | $ 3,997 | $ 2,607 |  |  |  |
Leases |  |  |  |  |  |
Lease, Practical Expedients, Package | false |  |  |  |  |
ASU 2016-16 |  |  |  |  |  |
Recently Adopted Accounting Pronouncements |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  | $ (3,000) |  |
Deferred tax asset |  |  |  |  | $ 3,000 |
1.25% Convertible Senior Notes Due 2022 |  |  |  |  |  |
Earnings (loss) per share: |  |  |  |  |  |
Interest rate (as a percentage) | 1.25% |  |  |  |  | 1.25%
Restatement Adjustment | ASU 2016-02 |  |  |  |  |  |
Leases |  |  |  |  |  |
ROU assets | $ 28,000 |  |  |  |  |
Lease liabilities | $ 30,000 |  |  |  |  |

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