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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Dilutive effect of the Notes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Lease, Practical Expedient, Use of Hindsight [true false] |  |  |  |  |  |  |  |  | true |  |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |
Transaction gain (loss) |  |  |  |  |  |  |  |  | $ (1,300) | $ (3,400) | $ 100
Computation of basic and diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ 25,894 | $ 18,773 | $ 20,038 | $ 9,344 | $ 13,965 | $ 19,558 | $ 20,986 | $ 20,743 | $ 74,049 | $ 75,252 | $ 64,796
Weighted average shares outstanding-basic |  |  |  |  |  |  |  |  | 17,968 | 18,191 | 18,097
Dilutive effect of equity awards |  |  |  |  |  |  |  |  | 420 | 409 | 623
Weighted average shares outstanding-diluted |  |  |  |  |  |  |  |  | 18,388 | 18,600 | 18,720
Basic earnings per share | $ 1.44 | $ 1.04 | $ 1.12 | $ 0.52 | $ 0.78 | $ 1.08 | $ 1.15 | $ 1.14 | $ 4.12 | $ 4.14 | $ 3.58
Diluted earnings per share | $ 1.40 | $ 1.03 | $ 1.10 | $ 0.51 | $ 0.76 | $ 1.06 | $ 1.12 | $ 1.10 | $ 4.03 | $ 4.05 | $ 3.46
Weighted average shares excluded from diluted earnings per share due to their anti-dilutive effect |  |  |  |  |  |  |  |  | 47 | 120 | 40
Warranty Provision |  |  |  |  |  |  |  |  |  |  |
Warranty provision at beginning of period |  |  |  | $ 20,825 |  |  |  | $ 21,724 | $ 20,825 | $ 21,724 | $ 21,819
Warranty claims provided for/assumed in acquisition |  |  |  |  |  |  |  |  | 5,419 | 7,551 | 8,867
Settlements made |  |  |  |  |  |  |  |  | (6,508) | (8,450) | (8,962)
Warranty provision at end of period | $ 19,736 |  |  |  | $ 20,825 |  |  |  | $ 19,736 | $ 20,825 | $ 21,724
1.25% Convertible Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |
Computation of basic and diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percentage) | 1.25% |  |  |  |  |  |  |  | 1.25% |  |
Conversion price | $ 107.46 |  |  |  |  |  |  |  | $ 107.46 |  |

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