Name:	ca_DiscounttoWeightedAveragePriceofCompanyStock
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the estimated maximum potential amount payable in the future, excluding interest and penalties, if any, under the indemnification in connection with the share repurchase arrangement with Careal Holding AG.

No definition available.

Name:	ca_IndemnificationMaximumPotentialFuturePayment
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Martin Haefner's wholly owned entity's ownership percentage of Careal Holding AG.

No definition available.

Name:	ca_OwnershipPercentageofRelatedPartysOwner
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The minimum percentage by which an Acquiring Person becomes the beneficial owner of the Company's common stock (other than grandfathered affiliates, so long as their aggregate ownership of common stock does not exceed 25% of the shares of the Company's outstanding common stock) that would trigger Separation Time.

No definition available.

Name:	ca_RightsPlanBeneficialOwnershipPercentageWithGrandfatheredExclusionMinimum
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Under certain events that trigger Separation Time, each Right, other than the rights held by an acquiring person, will automatically become a right to buy, for the exercise price, that number of shares of the Company's common stock (or, at the Company's option, participating preferred stock) having a market value of twice the exercise price.

No definition available.

Name:	ca_RightsPlanExercisePrice
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

A "Flip-in" Trigger will occur upon the earlier of (i) a public announcement by the Company that any person has become an Acquiring Person or (ii) an Acquiring Person acquiring more than 50% of the Company's outstanding shares of common stock.

No definition available.

Name:	ca_RightsPlanFlipinTrigger
Namespace Prefix:	ca_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The percentage of shares of the Company's outstanding common stock for which the aggregate ownership of grandfathered affiliates and associates shall not exceed.

No definition available.

Name:	ca_RightsPlanGrandfatheredSharesPercentageMaximum
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

A Qualified Offer, among other things, is an offer that contains a minimum tender condition of at least 50%.

No definition available.

Name:	ca_RightsPlanMinimumTenderCondition
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

On or after the Separation Time, the purchase price that each Right would initially entitle the holder to purchase one one-thousandth (0.001) of a share of the Company's participating preferred stock.

No definition available.

Name:	ca_RightsPlanPurchasePrice
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

In connection with a Qualified Offer, holders of 10% of the Company's common stock (excluding shares held by the offeror and its affiliates and associates), upon providing proper written notice, may direct the Company's Board of Directors to call a special meeting of shareholders for the purposes of voting on a resolution authorizing the redemption of the Rights pursuant to the provisions of the Rights Agreement.

No definition available.

Name:	ca_RightsPlanQualifiedOffer
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

At any time until a "Flip-in" Trigger has occurred, the price at which the Company's Board of Directors can redeem each Right.

No definition available.

Name:	ca_RightsPlanRedemptionPricePerRight
Namespace Prefix:	ca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The expiration date of the Rights, unless earlier redeemed by the Company's Board of Directors.

No definition available.

Name:	ca_RightsPlanRightsExpirationDate
Namespace Prefix:	ca_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

The expiration date of the Rights, unless earlier redeemed by the Company's Board of Directors, if the stockholders do not ratify the Rights Agreement.

No definition available.

Name:	ca_RightsPlanRightsExpirationDateRightsAgreementNotRatified
Namespace Prefix:	ca_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

On or after the Separation Time, each Right would initially entitle the holder to purchase one one-thousandth (0.001) of a share of the Company’s participating preferred stock.

No definition available.

Name:	ca_RightsPlanShares
Namespace Prefix:	ca_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The effective date of the Stockholder Protection Rights Agreement (Rights Agreement).

No definition available.

Name:	ca_RightsPlanStockholderProtectionRightsAgreementEffectiveDate
Namespace Prefix:	ca_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Shareholder ownership percentage of total Company stock outstanding after entering into share repurchase arrangement with Careal Holding AG.

No definition available.

Name:	ca_ShareholderOwnershipPercentageAfterShareRepurchaseArrangement
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Shareholder ownership percentage of total Company stock outstanding before entering into share repurchase arrangement with Careal Holding AG.

No definition available.

Name:	ca_ShareholderOwnershipPercentageBeforeShareRepurchaseArrangement
Namespace Prefix:	ca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

In connection with the share repurchase arrangement, the amount of shares of CA common stock Careal Holding AG (Careal) transferred to an entity wholly owned by Martin Haefner, a 50% owner of Careal.

No definition available.

Name:	ca_SharesofCommonStockTransferredbyCarealtoEntityWhollyOwnedbyMartinHaefner
Namespace Prefix:	ca_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Stock Repurchase Program.

No definition available.

Name:	ca_StockRepurchaseProgramLineItems
Namespace Prefix:	ca_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The cash outflow to reacquire common stock during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Total cost of shares repurchased divided by the total number of shares repurchased.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Name:	us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ca_CarealShareRepurchaseArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ca_CarealMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ca_MartinHaefnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ca_CarealanditsShareholdersCollectivelyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ShareRepurchaseProgramAxis=ca_PreviouslyApprovedStockRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: