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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 321,075 | $ 294,746 | $ 281,470 | $ 261,503 | $ 273,717 | $ 244,987 | $ 231,822 | $ 221,520 | $ 1,158,794 | $ 972,046 | $ 827,216
Operating income |  |  |  |  |  |  |  |  | 135,287 | 115,540 | 91,813
Interest expense | (5,049) | (5,014) | (4,644) | (3,645) | (2,262) | (1,936) | (1,365) | (1,246) | (18,352) | (6,809) | (3,081)
Other income, net | 1,031 | 1,496 | 1,965 | 767 | 445 | 2,164 | 6,045 | 1,402 | 5,259 | 10,056 | 1,223
Income taxes | (7,040) | (1,122) | (20,272) | (5,758) | (1,211) | (6,837) | (7,913) | (7,553) | (34,192) | (23,514) | (24,469)
Net earnings | 27,167 | $ 30,098 | $ 9,596 | $ 21,141 | 32,647 | $ 22,430 | $ 23,903 | $ 16,294 | 88,002 | 95,274 | 65,486
Depreciation and amortization |  |  |  |  |  |  |  |  | 80,770 | 63,637 | 56,663
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 161,323 | 142,945 | 58,170
Segment assets | 1,761,661 |  |  |  | 1,477,297 |  |  |  | 1,761,661 | 1,477,297 |
Equity Investment | 69,215 |  |  |  | 11,727 |  |  |  | 69,215 | 11,727 |
Goodwill | 270,678 |  |  |  | 250,342 |  |  |  | 270,678 | 250,342 | 233,755
II-VI Laser Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 103,390 |  |  |  | 84,180 |  |  |  | 103,390 | 84,180 | 84,105
II-VI Photonics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 114,398 |  |  |  | 113,272 |  |  |  | 114,398 | 113,272 | 96,760
II- VI Performance Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 52,890 |  |  |  | 52,890 |  |  |  | 52,890 | 52,890 | 52,890
Operating Segments | II-VI Laser Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 427,968 | 339,341 | 303,002
Inter-segment revenues |  |  |  |  |  |  |  |  | 34,661 | 33,792 | 24,290
Operating income |  |  |  |  |  |  |  |  | 36,797 | 30,931 | 36,184
Depreciation and amortization |  |  |  |  |  |  |  |  | 38,552 | 24,958 | 17,222
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 82,478 | 82,760 | 25,620
Segment assets | 760,988 |  |  |  | 589,239 |  |  |  | 760,988 | 589,239 |
Goodwill | 103,390 |  |  |  | 84,180 |  |  |  | 103,390 | 84,180 |
Operating Segments | II-VI Photonics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 464,457 | 418,515 | 325,879
Inter-segment revenues |  |  |  |  |  |  |  |  | 14,542 | 14,236 | 12,081
Operating income |  |  |  |  |  |  |  |  | 67,732 | 62,975 | 37,849
Depreciation and amortization |  |  |  |  |  |  |  |  | 24,984 | 21,442 | 19,855
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 39,162 | 27,397 | 21,096
Segment assets | 595,909 |  |  |  | 578,315 |  |  |  | 595,909 | 578,315 |
Goodwill | 114,398 |  |  |  | 113,272 |  |  |  | 114,398 | 113,272 |
Operating Segments | II- VI Performance Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 266,369 | 214,190 | 198,335
Inter-segment revenues |  |  |  |  |  |  |  |  | 5,609 | 10,189 | 7,274
Operating income |  |  |  |  |  |  |  |  | 30,758 | 21,635 | 17,780
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,234 | 17,237 | 19,586
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 39,683 | 32,788 | 11,454
Segment assets | 404,764 |  |  |  | 309,743 |  |  |  | 404,764 | 309,743 |
Equity Investment | 69,215 |  |  |  | 11,727 |  |  |  | 69,215 | 11,727 |
Goodwill | $ 52,890 |  |  |  | $ 52,890 |  |  |  | 52,890 | 52,890 |
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Inter-segment revenues |  |  |  |  |  |  |  |  | $ (54,812) | $ (58,217) | $ (43,645)

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