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Components of Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | ---
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | $ 591,479 |
Total debt | 537,144 | $ 439,013
Current portion of long-term debt | (20,000) | (20,000)
Long-term debt, less current portion | 517,144 | 419,013
0.25% Convertible Senior Note Due 2022 |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 345,000 | 345,000
Convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount | (53,300) | (56,409)
Note payable |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 3,834 |
Integrated Photonics, Inc | Note payable |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 3,834 | 3,834
Line of credit |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 180,000 | 80,000
Term Loans |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 60,000 | 65,000
Yen denominated line of credit |  |
Line Of Credit Facility [Line Items] |  |
Total debt, Gross | 2,645 | 2,714
Credit Facility |  |
Line Of Credit Facility [Line Items] |  |
Credit facility unamortized debt issuance costs | $ (1,035) | $ (1,126)

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