Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Description of the Business and Significant Accounting Policies Revenue Recognition (Details)	3 Months Ended	9 Months Ended
	Oct. 31, 2023 USD ($)	Oct. 31, 2023 USD ($) segment	Sep. 20, 2023 $ / shares
Segments
Number of operating segments \| segment		1
Minimum
Revenue Recognition
Accounts receivable payment terms		45 days
Cisco Merger Agreement
Business Combinations [Abstract]
Debt instrument, converted, right to receive cash (in dollars per share) \| $ / shares			$ 157.00
Business acquisition, termination fee payable	$ 1,000,000,000	$ 1,000,000,000
Business acquisition, termination fee receivable	1,478,000,000	1,478,000,000
Merger-related expenses	$ 22,000,000	$ 22,000,000