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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 273,717 | $ 244,987 | $ 231,822 | $ 221,520 | $ 241,470 | $ 205,105 | $ 191,434 | $ 189,207 | $ 972,046 | $ 827,216 | $ 741,961
Operating income |  |  |  |  |  |  |  |  | 115,541 | 91,813 | 76,799
Interest expense | (2,262) | (1,936) | (1,365) | (1,246) | (1,066) | (769) | (597) | (649) | (6,809) | (3,081) | (3,863)
Other income, net | 445 | 2,164 | 6,045 | 1,402 | 429 | (1,257) | 994 | 1,057 | 10,056 | 1,223 | 6,176
Income taxes | (1,211) | (6,837) | (7,913) | (7,553) | (13,934) | (2,426) | (3,187) | (4,922) | (23,514) | (24,469) | (13,137)
Net earnings | 32,647 | $ 22,430 | $ 23,903 | $ 16,294 | 14,343 | $ 14,938 | $ 18,991 | $ 17,214 | 95,274 | 65,486 | 65,975
Depreciation and amortization |  |  |  |  |  |  |  |  | 63,637 | 56,663 | 53,083
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 142,945 | 58,170 | 52,313
Segment assets | 1,477,297 |  |  |  | 1,211,981 |  |  |  | 1,477,297 | 1,211,981 |
Equity investment | 11,727 |  |  |  | 11,354 |  |  |  | 11,727 | 11,354 |
Goodwill | 250,342 |  |  |  | 233,755 |  |  |  | 250,342 | 233,755 | 195,894
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Inter-segment revenues |  |  |  |  |  |  |  |  | (58,217) | (43,645) | (43,556)
II-VI Laser Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 84,180 |  |  |  | 84,105 |  |  |  | 84,180 | 84,105 | 43,578
II-VI Laser Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 339,341 | 303,002 | 287,881
Inter-segment revenues |  |  |  |  |  |  |  |  | 33,792 | 24,290 | 21,021
Operating income |  |  |  |  |  |  |  |  | 30,931 | 36,184 | 55,039
Depreciation and amortization |  |  |  |  |  |  |  |  | 24,958 | 17,222 | 14,127
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 82,760 | 25,620 | 27,349
Segment assets | 589,239 |  |  |  | 469,754 |  |  |  | 589,239 | 469,754 |
Goodwill | 84,180 |  |  |  | 84,105 |  |  |  | 84,180 | 84,105 |
II-VI Photonics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 113,272 |  |  |  | 96,760 |  |  |  | 113,272 | 96,760 | 99,426
II-VI Photonics | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 418,515 | 325,879 | 260,825
Inter-segment revenues |  |  |  |  |  |  |  |  | 14,236 | 12,081 | 13,210
Operating income |  |  |  |  |  |  |  |  | 62,975 | 37,849 | 7,208
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,442 | 19,855 | 21,073
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 27,397 | 21,096 | 11,324
Segment assets | 578,315 |  |  |  | 467,486 |  |  |  | 578,315 | 467,486 |
Goodwill | 113,272 |  |  |  | 96,760 |  |  |  | 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
II- VI Performance Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 214,190 | 198,335 | 193,255
Inter-segment revenues |  |  |  |  |  |  |  |  | 10,189 | 7,274 | 9,325
Operating income |  |  |  |  |  |  |  |  | 21,635 | 17,780 | 14,552
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,237 | 19,586 | 17,883
Expenditures for property, plant & equipment |  |  |  |  |  |  |  |  | 32,788 | 11,454 | $ 13,640
Segment assets | 309,743 |  |  |  | 274,741 |  |  |  | 309,743 | 274,741 |
Equity investment | 11,727 |  |  |  | 11,354 |  |  |  | 11,727 | 11,354 |
Goodwill | $ 52,890 |  |  |  | $ 52,890 |  |  |  | $ 52,890 | $ 52,890 |

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