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Earnings (Loss) Per Share Calculation (Tables) | 12 Months Ended
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Oct. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of numerator and denominator of Basic and Diluted Earnings Per Share | The following tables (in thousands except per share amounts) reconcile Basic EPS and Diluted EPS. Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of the following, in each case, to the extent the effect is not anti-dilutive: (i) common shares outstanding, (ii) shares issuable upon vesting of stock unit awards; and (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method. Numerator
| Year Ended
| October 31, 2020 |  | November 2, 2019 |  | November 3, 2018
Net income (loss) | $ | 361,291 |  |  | $ | 253,434 |  |  | $ | (344,690) |
Less: Loss on fair value of debt conversion liability | — |  |  | — |  |  | (12,894) |
Net income (loss) used to calculate Diluted EPS | $ | 361,291 |  |  | $ | 253,434 |  |  | $ | (357,584) |
Denominator
| Year Ended
| October 31, 2020 |  | November 2, 2019 |  | November 3, 2018
Basic weighted average shares outstanding | 154,287 |  |  | 155,720 |  |  | 143,738 |
Add: Shares underlying outstanding stock options, employee stock purchase plan and restricted stock units | 1,668 |  |  | 1,892 |  |  | — |
Diluted weighted average shares outstanding | 155,955 |  |  | 157,612 |  |  | 143,738 |
EPS
| Year Ended
| October 31, 2020 |  | November 2, 2019 |  | November 3, 2018
Basic EPS | $ | 2.34 |  |  | $ | 1.63 |  |  | $ | (2.40) |
Diluted EPS | $ | 2.32 |  |  | $ | 1.61 |  |  | $ | (2.49) |
Weighted average shares excluded from calculation of denominator for Basic and Diluted EPS | The following table summarizes the weighted average shares excluded from the calculation of the denominator for Diluted EPS due to their anti-dilutive effect for the fiscal years indicated (in thousands):
| Year Ended
| October 31, 2020 |  | November 2, 2019 |  | November 3, 2018
Shares underlying stock options and restricted stock units | 263 |  |  | 234 |  |  | 2,235 |
Add: Shares underlying 3.75% Convertible Senior Notes due 2018 (New Notes) | — |  |  | — |  |  | 1,780 |
3.75% Convertible Senior Notes due October 15, 2018 (Original Notes) | — |  |  | — |  |  | 2,883 |
4.0% Convertible Senior Notes due December 15, 2020 | — |  |  | — |  |  | 9,123 |
Total shares excluded due to anti-dilutive effect | 263 |  |  | 234 |  |  | 16,021 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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