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Stock-Based Compensation (PSUs, RSUs and Restricted Stock) - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 15, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 22, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share granted |  | 545,000 |  |  |
Recognition period of unvested compensation expense |  | 2 years 8 months 12 days |  |  |
Options available for issuance under stockholders-approved equity plan |  | 3,400,000 |  |  |
ADVA Optical Networking SE, [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Recognition period of unvested compensation expense |  | 1 year 1 month 6 days |  |  |
Number of market based PSU awards converted to time based RSU awards | 300,000 |  |  |  |
Options available for issuance under stockholders-approved equity plan |  |  |  |  | 2,000,000.0
Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options available for issuance under stockholders-approved equity plan |  | 2,100,000 |  |  |
Performance Stock Units (PSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share granted |  | 300,000 | 300,000 |  |
Vesting period |  | 1 year | 2 years | 3 years |
Performance Stock Units (PSUs) [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of performance stock units granted |  | 0.00% | 0.00% | 0.00% |
Performance Stock Units (PSUs) [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of performance stock units granted |  | 142.80% | 142.80% | 142.80% |
Market-Based PSUs, RSUs and Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to other than options |  | $ 24.6 |  |  |
Recognition period of unvested compensation expense |  | 1 year 7 months 6 days |  |  |
Time-Based RSUs [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to other than options | $ 17.8 | $ 8.9 |  |  |
Recognition period of unvested compensation expense | 3 months 18 days |  |  |  |
Time-Based RSUs [Member] | ADVA Optical Networking SE, [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to other than options |  | $ 2.1 |  |  |
Recognition period of unvested compensation expense |  | 1 year 1 month 6 days |  |  |

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- Definition Share based compensation arrangement by share based payment award earn out percentage. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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