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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Jun. 30, 2018
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation expense in the consolidated statements of operations | We recorded stock-based-compensation expense in the consolidated statement of operations as follows (in thousands):
|  | 2016 |  | 2017 |  | 2018 |
Cost of goods sold |  | $ | 1,199 |  | $ | 1,443 |  | $ | 972 |
Selling, general and administrative |  |  | 19,307 |  |  | 21,354 |  |  | 22,293 |
Research and development |  |  | 253 |  |  | 433 |  |  | 581 |
Restructuring |  |  | — |  |  | 2,902 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock based compensation expense |  |  | 20,759 |  |  | 26,132 |  |  | 23,846 |
Less: Related income tax benefit |  |  | (7,762 | ) |  | (9,815 | ) |  | (7,391 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock based compensation expense, net |  | $ | 12,997 |  | $ | 16,317 |  | $ | 16,455 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of weighted average assumptions used to determine the fair value calculations for stock options issued |
|  | 2016 |  | 2017 |  | 2018 |
Expected dividend |  |  | — |  |  | — |  |  | — |
Risk-free interest rate |  |  | 1.4 | % |  | 1.7 | % |  | 1.9 | %
Expected volatility |  |  | 31.0 | % |  | 33.0 | % |  | 29.0 | %
Expected holding period (in years) |  |  | 4.5 |  |  | 4.5 |  |  | 4.5 |
Summary of stock option activity |
|  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at June 30, 2015 |  |  | 1,012,650 |  |  | 27.30 |  |  |  |  |  |  |
Granted |  |  | 35,162 |  |  | 73.42 |  |  |  |  |  |  |
Exercised |  |  | (107,059 | ) |  | 28.05 |  |  |  |  |  |  |
Expired or forfeited |  |  | (6,641 | ) |  | 66.56 |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2016 |  |  | 934,112 |  |  | 28.67 |  |  |  |  |  |  |
Granted |  |  | 19,176 |  |  | 73.42 |  |  |  |  |  |  |
Exercised |  |  | (168,564 | ) |  | 26.68 |  |  |  |  |  |  |
Expired or forfeited |  |  | (4,053 | ) |  | 68.28 |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 |  |  | 2.9 years |  | $ | 30,364 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at June 30, 2018 |  |  | 635,160 |  | $ | 29.62 |  |  | 2.5 years |  | $ | 30,301 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of restricted stock award and RSU award activity |
|  | Shares |  | Weighted- Average Fair Value |
Nonvested at June 30, 2015 |  |  | 659,906 |  | $ | 63.75 |
Granted |  |  | 337,628 |  |  | 72.90 |
Vested |  |  | (417,896 | ) |  | 65.36 |
Forfeited |  |  | (49,140 | ) |  | 67.70 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nonvested at June 30, 2016 |  |  | 530,498 |  | $ | 67.94 |
Granted |  |  | 379,888 |  |  | 64.55 |
Vested |  |  | (299,277 | ) |  | 67.87 |
Net replacement RSUs (1) |  |  | 20,953 |  |  | 67.76 |
Forfeited |  |  | (20,375 | ) |  | 68.34 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) | Pursuant to the acquisition of AS&E, we assumed unvested RSUs originally granted by AS&E and converted them into RSUs for our Common Stock.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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