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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Jun. 30, 2020
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation expense in the consolidated statements of operations | We recorded stock-based compensation expense in the consolidated statements of operations as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2018 |  | 2019 |  | 2020
Cost of goods sold | ​ | $ | 972 | ​ | $ | 732 | ​ | $ | 708
Selling, general and administrative | ​ |  | 22,293 | ​ |  | 23,876 | ​ |  | 22,546
Research and development | ​ |  | 581 | ​ |  | 643 | ​ |  | 563
Stock based compensation expense | ​ | $ | 23,846 | ​ | $ | 25,251 | ​ | $ | 23,817
Schedule of weighted average assumptions used to determine the fair value calculations for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2018 |  | 2019 |  | 2020 |
Expected dividend |  | — | ​ | — | ​ | — | ​
Risk-free interest rate |  | 1.9 | % | 2.6 | % | 1.6 | %
Expected volatility |  | 29.0 | % | 28.0 | % | 26.0 | %
Expected holding period (in years) |  | 4.5 | ​ | 4.5 | ​ | 4.5 | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining Contractual | ​ | Intrinsic Value
​ |  | Options |  | Price |  | Term |  | (in thousands)
Outstanding at June 30, 2017 |  | 780,671 |  | ​ | 30.00 | ​ | ​ | ​ | ​ | ​
Granted |  | 25,379 |  | ​ | 85.83 | ​ | ​ | ​ | ​ | ​
Exercised |  | (121,651) |  | ​ | 23.53 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (6,874) |  | ​ | 73.77 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2018 |  | 677,525 |  | $ | 32.80 | ​ | ​ | ​ | ​ | ​
Granted |  | 19,259 |  | ​ | 73.37 | ​ | ​ | ​ | ​ | ​
Exercised |  | (169,799) |  | ​ | 32.11 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (11,101) |  | ​ | 70.50 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2019 |  | 515,884 |  | $ | 33.74 |  | ​ | ​ | ​ | ​
Granted |  | 13,263 | ​ | ​ | 101.31 | ​ | ​ | ​ | ​ | ​
Exercised |  | (201,150) | ​ | ​ | 20.48 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (1,693) | ​ | ​ | 81.79 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2020 |  | 326,304 | ​ | $ | 44.41 | ​ | 2.4 years | ​ | $ | 10,403
Exercisable at June 30, 2020 | ​ | 295,533 | ​ | $ | 39.89 |  | 1.8 years | ​ | $ | 10,378
Summary of restricted stock award and RSU award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average
​ |  | Shares |  | Fair Value
Nonvested at June 30, 2017 |  | 611,687 | ​ | $ | 65.85
Granted |  | 351,034 | ​ |  | 74.09
Vested |  | (413,639) | ​ |  | 65.33
Forfeited |  | (22,705) | ​ |  | 70.32
Nonvested at June 30, 2018 |  | 526,377 | ​ | $ | 71.56
Granted |  | 375,580 | ​ |  | 74.40
Vested |  | (364,410) | ​ |  | 70.92
Forfeited |  | (16,407) | ​ |  | 74.13
Nonvested at June 30, 2019 |  | 521,140 | ​ | $ | 73.97
Granted |  | 308,431 | ​ | ​ | 87.88
Vested |  | (390,613) | ​ | ​ | 68.63
Forfeited |  | (15,368) | ​ | ​ | 83.36
Nonvested at June 30, 2020 |  | 423,590 | ​ | $ | 88.68

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