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STOCKHOLDERS' EQUITY - Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Stock-based Compensation |  |  |  |
Stock-based compensation expense |  | $ 26,771 | $ 23,817 | $ 25,251
Weighted average assumptions used to determine the fair value calculations for stock options issued |  |  |  |
Expected holding period (in years) |  | 4 years 6 months | 4 years 6 months | 4 years 6 months
Weighted-Average Fair Value |  |  |  |
Granted (in dollars per share) |  |  | $ 87.88 | $ 74.40
RSU |  |  |  |
Stock-based Compensation |  |  |  |
Unrecognized compensation cost |  | $ 13,900 |  |
Weighted-average period |  | 2 years 1 month 6 days |  |
Stock options |  |  |  |
Stock-based Compensation |  |  |  |
Unrecognized compensation cost |  | $ 500 |  |
Weighted-average period |  | 1 year 10 months 24 days |  |
Employee Stock Purchase Plan |  |  |  |
Stock-based Compensation |  |  |  |
Shares purchased |  | 63,499 | 69,399 | 70,857
Shares available for grant |  | 537,935 |  |
Employee Stock Purchase Plan | Maximum |  |  |  |
Stock-based Compensation |  |  |  |
Discount rate for eligible employees to purchase common stock (as a percent) |  | 15.00% |  |
OSI Plans | RSU |  |  |  |
Shares |  |  |  |
Nonvested at the beginning of the period (in shares) |  | 423,590 | 521,140 | 526,377
Granted (in shares) |  | 339,311 | 308,431 | 375,580
Vested (in shares) |  | (313.892) | (390,613) | (364,410)
Forfeited (in shares) |  | (13,084) | (15,368) | (16,407)
Nonvested at the end of the period (in shares) |  | 435,925 | 423,590 | 521,140
Weighted-Average Fair Value |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 88.68 | $ 73.97 | $ 71.56
Granted (in dollars per share) |  | 80.40 | 87.88 | 74.40
Vested (in dollars per share) |  | 86.12 | 68.63 | 70.92
Forfeited (in dollars per share) |  | 85.78 | 83.36 | 74.13
Nonvested at the end of the period (in dollars per share) |  | 84.16 | $ 88.68 | $ 73.97
OSI Plans | Restricted stock and RSU |  |  |  |
Weighted-Average Fair Value |  |  |  |
Granted (in dollars per share) |  | $ 80.40 |  |
Total fair value of shares vested |  | $ 27,000 | $ 26,800 | $ 25,800
OSI Plans | Restricted stock and RSU | Minimum |  |  |  |
Stock-based Compensation |  |  |  |
Vesting period |  | 3 years |  |
OSI Plans | Restricted stock and RSU | Maximum |  |  |  |
Stock-based Compensation |  |  |  |
Vesting period |  | 4 years |  |
OSI Plans | Stock options |  |  |  |
Stock-based Compensation |  |  |  |
Vesting period |  | 3 years |  |
Number of Options |  |  |  |
Outstanding at the beginning of the period (in shares) |  | 326,304 | 515,884 | 677,525
Granted (in shares) |  | 22,171 | 13,263 | 19,259
Exercised (in shares) |  | (88,657) | (201,150) | (169,799)
Expired or forfeited (in shares) |  | (4,598) | (1,693) | (11,101)
Outstanding at the end of the period (in shares) |  | 255,220 | 326,304 | 515,884
Exercisable at the end of the period (in shares) |  | 221,090 |  |
Weighted average assumptions used to determine the fair value calculations for stock options issued |  |  |  |
Risk-free interest rate (as percent) |  | 0.40% | 1.60% | 2.60%
Expected volatility (as percent) |  | 26.00% | 26.00% | 28.00%
Weighted Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 44.41 | $ 33.74 | $ 32.80
Granted (in dollars per share) |  | 82.17 | 101.31 | 73.37
Exercised (in dollars per share) |  | 35.19 | 20.48 | 32.11
Expired or forfeited (in dollars per share) |  | 80.46 | 81.79 | 70.50
Outstanding at the end of the period (in dollars per share) |  | 50.24 | 44.41 | 33.74
Exercisable at the end of the period (in dollars per share) |  | $ 44.80 |  |
Weighted-Average Remaining Contractual Term |  |  |  |
Outstanding at the end of the period |  | 2 years 6 months |  |
Exercisable at the end of the period |  | 1 year 6 months |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding at the end of the period |  | $ 13,118 |  |
Exercisable at the end of the period |  | $ 12,567 |  |
Stock-based compensation, other disclosures |  |  |  |
Weighted-average grant-date fair value of stock options (in dollars per share) |  | $ 18.37 | $ 24.88 | $ 20.45
Total intrinsic value of options exercised |  | $ 3,900 |  |
OSI Plans | Performance-based restricted stock units |  |  |  |
Shares |  |  |  |
Granted (in shares) |  | 136,242 | 81,621 | 97,514
OSI Plans | Performance-based restricted stock units | Minimum |  |  |  |
Weighted-Average Fair Value |  |  |  |
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock |  | 0.00% |  |
OSI Plans | Performance-based restricted stock units | Maximum |  |  |  |
Weighted-Average Fair Value |  |  |  |
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock |  | 400.00% |  |
OSI Plans | Incentive stock options | Minimum |  |  |  |
Stock-based Compensation |  |  |  |
Percentage of voting power owned |  | 10.00% |  |
Purchase price expressed as a percentage of the fair market value of the Company's common stock on the date of grant |  | 110.00% |  |
OSI Plans | Nonqualified options | Minimum |  |  |  |
Stock-based Compensation |  |  |  |
Percentage of voting power owned |  | 10.00% |  |
Purchase price expressed as a percentage of the fair market value of the Company's common stock on the date of grant |  | 110.00% |  |
2012 Plan |  |  |  |
Stock-based Compensation |  |  |  |
Additional maximum number of shares of common stock which may be issued | 1,650,000 |  |  |
Increase in maximum number of shares authorized under share based compensation plan | 7,100,000 |  |  |
Shares available for grant |  | 2,100,000 |  |
2012 Plan | Restricted stock and RSU |  |  |  |
Weighted-Average Fair Value |  |  |  |
Number of shares available for grant reduced for each award granted |  | 1.87 |  |
Number of shares available for grant increased for each award forfeited and returned |  | 1.87 |  |
2006 Plan |  |  |  |
Shares |  |  |  |
Granted (in shares) |  | 0 |  |
Cost of goods sold |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense |  | $ 760 | $ 708 | $ 732
Selling, general and administrative |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense |  | 25,457 | 22,546 | 23,876
Research and development |  |  |  |
Stock-based Compensation |  |  |  |
Stock-based compensation expense |  | $ 554 | $ 563 | $ 643

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