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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jun. 30, 2022
STOCKHOLDERS' EQUITY |
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 |  | 2021 |  | 2022
Cost of goods sold | ​ | $ | 708 | ​ | $ | 760 | ​ | $ | 812
Selling, general and administrative | ​ |  | 22,546 | ​ |  | 25,457 | ​ |  | 26,749
Research and development | ​ |  | 563 | ​ |  | 554 | ​ |  | 511
Stock-based compensation expense | ​ | $ | 23,817 | ​ | $ | 26,771 | ​ | $ | 28,072
Schedule of weighted average assumptions used to determine the fair value calculations for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2021 |  | 2022 |
Expected dividend |  | — | ​ | — | ​ | — | ​
Risk-free interest rate |  | 1.6 | % | 0.4 | % | 1.2 | %
Expected volatility |  | 26.0 | % | 26.0 | % | 31.0 | %
Expected holding period (in years) |  | 4.5 | ​ | 4.5 | ​ | 4.5 | ​
Summary of stock option activity | The following summarizes stock option activity for fiscal years 2020, 2021 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining Contractual | ​ | Intrinsic Value
​ |  | Options |  | Price |  | Term |  | (in thousands)
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 | ​ | ​ | ​ | ​ | ​
Granted |  | 22,171 |  | ​ | 82.17 | ​ | ​ | ​ | ​ | ​
Exercised |  | (88,657) |  | ​ | 35.19 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (4,598) |  | ​ | 80.46 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2021 |  | 255,220 |  | $ | 50.24 |  | ​ | ​ | ​ | ​
Granted |  | 22,954 | ​ | ​ | 96.38 | ​ | ​ | ​ | ​ | ​
Exercised |  | (166,629) | ​ | ​ | 35.09 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (900) | ​ | ​ | 73.99 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2022 |  | 110,645 | ​ | $ | 82.43 | ​ | 6.1 years | ​ | $ | 815
Exercisable at June 30, 2022 | ​ | 70,354 | ​ | $ | 76.76 |  | 4.5 years | ​ | $ | 774
Summary of RSU award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average
​ |  | Shares |  | Fair Value
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
Granted |  | 339,311 | ​ |  | 80.40
Vested |  | (313.892) | ​ |  | 86.12
Forfeited |  | (13,084) | ​ |  | 85.78
Nonvested at June 30, 2021 |  | 435,925 | ​ | $ | 84.16
Granted |  | 334,435 | ​ | ​ | 90.31
Vested |  | (337,442) | ​ | ​ | 82.66
Forfeited |  | (5,471) | ​ | ​ | 83.66
Nonvested at June 30, 2022 |  | 427,447 | ​ | $ | 90.17

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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