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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation and Transactions, Earnings per Share, Warranty Provision & Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Foreign Currency Translation |  |  |  |
Transaction gain (loss) |  | $ (1,300) | $ 2,000 | $ (800)
Earnings (loss) per share: |  |  |  |
Stock option and stock awards excluded from computation due to antidilutive effect (in shares) |  | 1,300 | 100 | 100
Computation of basic and diluted earnings per share |  |  |  |
Net income (loss) available to common stockholders |  | $ (29,127) | $ 21,076 | $ 26,157
Weighted average shares outstanding-basic |  | 18,592 | 18,894 | 19,427
Dilutive effect of equity awards |  |  | 795 | 649
Weighted average shares outstanding-diluted |  | 18,592 | 19,689 | 20,076
Basic earnings (loss) per share |  | $ (1.57) | $ 1.12 | $ 1.35
Diluted earnings (loss) per share |  | $ (1.57) | $ 1.07 | $ 1.30
Changes in warranty provision |  |  |  |
Warranty provision at beginning of period | $ 21,819 | $ 15,178 | $ 15,948 | $ 12,738
Warranty claims provided for/assumed in acquisition |  | 14,156 | 5,793 | 12,296
Settlements made |  | (7,515) | (6,563) | (9,086)
Warranty provision at end of period |  | 21,819 | $ 15,178 | $ 15,948
Subsequent Events |  |  |  |
Maximum earnout consideration |  | $ 29,900 |  |
Optoelectronics solutions business | Subsequent Event |  |  |  |
Subsequent Events |  |  |  |
Consideration paid | 17,500 |  |  |
Maximum earnout consideration | $ 1,000 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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