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Debt - Components of Debt (Detail) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |
Total debt |  | $ 1,385,452 | $ 2,255,342 |
Current portion of long-term debt |  | (62,050) | (69,250) |
Long-term debt, less current portion |  | $ 1,323,402 | 2,186,092 |
0.50% Convertible Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, interest rate |  | 0.50% |  |
Total debt, gross |  | $ 14,900 |  |
0.50% Convertible Senior Notes | Finisar Corporation |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total debt, gross |  | $ 14,888 | 14,888 |
0.25% Convertible Senior Notes due 2022 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, interest rate |  | 0.25% |  | 0.25%
Total debt, gross |  | $ 344,988 | 345,000 |
0.25% convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount |  | (20,425) | (30,688) |
Term A Loan Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total debt, gross |  | $ 1,072,925 | 1,194,463 |
Term A Loan Facility | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, rate added on variable rate |  | 1.375% |  |
Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total debt, gross |  | $ 0 | 74,000 |
Revolving Credit Facility | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, rate added on variable rate |  | 1.375% |  |
Term A Facility and Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility unamortized debt issuance costs |  | $ (26,924) | (32,174) |
Term B Loan Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total debt, gross |  | 0 | 714,600 |
Credit facility unamortized debt issuance costs |  | $ 0 | $ (24,747) |
Term B Loan Facility | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, rate added on variable rate | 3.50% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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