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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Revenues | $ 294,746 | $ 244,987 | $ 837,719 | $ 698,329 |
Operating income | 34,738 | 29,039 | 97,062 | 79,866 |
Interest expense | (5,014) | (1,936) | (13,303) | (4,547) |
Other income (expense), net | 1,496 | 2,164 | 4,228 | 9,611 |
Income taxes | (1,122) | (6,837) | (27,152) | (22,303) |
Net earnings | 30,098 | 22,430 | 60,835 | 62,627 |
Depreciation and amortization | 19,924 | 14,924 | 58,149 | 44,722 |
Segment assets | 1,737,234 |  | 1,737,234 |  | $ 1,477,297
Expenditures for property, plant & equipment | 38,614 | 41,313 | 115,437 | 99,135 |
Investments | 68,222 |  | 68,222 |  | $ 11,727
Operating Segments | II-VI Laser Solutions |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Revenues | 109,796 | 83,648 | 312,875 | 244,421 |
Inter-segment revenues | 8,256 | 9,661 | 22,270 | 24,361 |
Operating income | 9,932 | 8,337 | 22,689 | 22,628 |
Depreciation and amortization | 10,306 | 5,713 | 27,560 | 17,025 |
Segment assets | 769,649 |  | 769,649 |  |
Expenditures for property, plant & equipment | 16,773 | 23,299 | 53,949 | 59,161 |
Operating Segments | II-VI Photonics |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Revenues | 116,778 | 109,099 | 337,912 | 305,824 |
Inter-segment revenues | (501) | 3,450 | 10,991 | 10,049 |
Operating income | 16,637 | 15,898 | 53,066 | 45,689 |
Depreciation and amortization | 5,651 | 5,029 | 18,382 | 14,853 |
Segment assets | 586,475 |  | 586,475 |  |
Expenditures for property, plant & equipment | 15,461 | 8,727 | 35,077 | 21,224 |
Operating Segments | II- VI Performance Products |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Revenues | 68,172 | 52,240 | 186,932 | 148,084 |
Inter-segment revenues | 1,707 | 2,713 | 3,691 | 7,091 |
Operating income | 8,169 | 4,804 | 21,307 | 11,549 |
Depreciation and amortization | 3,967 | 4,182 | 12,207 | 12,844 |
Segment assets | 381,110 |  | 381,110 |  |
Expenditures for property, plant & equipment | 6,380 | 9,287 | 26,411 | 18,750 |
Investments | 68,222 |  | 68,222 |  |
Eliminations |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Inter-segment revenues | $ (9,462) | $ (15,824) | $ (36,952) | $ (41,501) |

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