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STOCK-BASED COMPENSATION - Stock based compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Stock based compensation expense |  |  |
Stock-based compensation expense before taxes | $ 25,251 | $ 23,846 | $ 26,132
RSU |  |  |
Stock-based compensation, other disclosures |  |  |
Unrecognized compensation cost | 13,300 |  |
Weighted-average period |  | 2 years |
Stock options |  |  |
Stock-based compensation, other disclosures |  |  |
Unrecognized compensation cost | 500 |  |
Weighted-average period |  | 1 year 9 months 18 days |
Cost of goods sold |  |  |
Stock based compensation expense |  |  |
Stock-based compensation expense before taxes | 732 | $ 972 | 1,443
Selling, general and administrative |  |  |
Stock based compensation expense |  |  |
Stock-based compensation expense before taxes | 23,876 | 22,293 | 21,354
Research and development |  |  |
Stock based compensation expense |  |  |
Stock-based compensation expense before taxes | $ 643 | $ 581 | 433
Restructuring |  |  |
Stock based compensation expense |  |  |
Stock-based compensation expense before taxes |  |  | $ 2,902
2005 AS&E Plan and the 2014 AS&E Plan | RSU |  |  |
Stock based compensation expense |  |  |
Granted (in shares) | 0 |  |
2006 Plan |  |  |
Stock based compensation expense |  |  |
Granted (in shares) | 0 |  |

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