Subsequent Events (Details)	Jul. 11, 2018 $ / shares
Subsequent Event - Merger Agreement
Subsequent Event [Line Items]
Amount paid to shareholders by acquiree (in dollars per share)	$ 44.50

Represents the per share amount of each issued and outstanding share of Company common stock (other than shares (i) owned or held in treasury by the Company or owned by Broadcom or Merger Sub, (ii) owned by any subsidiary of Broadcom or of the Company and (iii) held by the Company’s stockholders who perfect their appraisal rights with respect to the Merger) to be received by the shareholders in cash from the Merger Agreement at the effective time of the merger.

No definition available.

Name:	ca_AmountPaidToShareholdersByAcquiree
Namespace Prefix:	ca_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration