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Stock Incentive Plans - Schedule of Share Based Compensation Shares Authorized (Details) - $ / shares | Dec. 31, 2020 | Mar. 31, 2020
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Reserved for issuance (in shares) | 52,195,000 |
Available for future grants (in shares) | 33,395,410 |
DXC Employee Equity Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reserved for issuance (in shares) | 51,200,000 |
Available for future grants (in shares) | 32,794,274 |
DXC Director Equity Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reserved for issuance (in shares) | 745,000 |
Available for future grants (in shares) | 435,951 |
DXC Share Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reserved for issuance (in shares) | 250,000 |
Available for future grants (in shares) | 165,185 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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