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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | $ 314,433 | $ 261,503 |
Operating income | 37,213 | 29,777 |
Interest expense | (5,584) | (3,645) |
Other income (expense), net | 713 | 767 |
Income taxes | (6,193) | (5,758) |
Net earnings | 26,149 | 21,141 |
Depreciation and amortization | 22,170 | 18,816 |
Segment assets | 1,880,643 |  | $ 1,761,661
Expenditures for property, plant & equipment | 34,918 | 37,426 |
Investments | 75,289 |  | $ 69,215
II-VI Laser Solutions |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 106,175 |  |
II-VI Photonics |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 135,156 |  |
II- VI Performance Products |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 73,102 |  |
Operating Segments | II-VI Laser Solutions |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 106,175 | 87,936 |
Inter-segment revenues | 13,553 | 7,180 |
Operating income | 12,310 | 2,655 |
Depreciation and amortization | 10,847 | 8,224 |
Segment assets | 751,801 |  |
Expenditures for property, plant & equipment | 11,593 | 12,761 |
Operating Segments | II-VI Photonics |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 135,156 | 115,940 |
Inter-segment revenues | 2,896 | 2,863 |
Operating income | 15,912 | 20,108 |
Depreciation and amortization | 6,199 | 5,507 |
Segment assets | 671,992 |  |
Expenditures for property, plant & equipment | 12,051 | 9,782 |
Investments | 13,373 |  |
Operating Segments | II- VI Performance Products |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Revenues | 73,102 | 57,627 |
Inter-segment revenues | 5,662 | 827 |
Operating income | 8,991 | 7,014 |
Depreciation and amortization | 5,124 | 5,085 |
Segment assets | 456,850 |  |
Expenditures for property, plant & equipment | 11,274 | 14,883 |
Investments | 61,916 |  |
Eliminations |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Inter-segment revenues | $ (22,111) | $ (10,870) |

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