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Business Combinations
 12 Months Ended
Sep. 30, 2025
Business Combination [Abstract]  
Business Combinations Business Combinations
Fiscal Year 2025 Acquisition of CalypsoAI Corp
On September 26, 2025, the Company closed on a transaction for the acquisition of CalypsoAI Corp. ("CalypsoAI"), a provider in enterprise AI security for $145.2 million in cash, with CalypsoAI immediately becoming a wholly-owned subsidiary of F5 upon the closing of the transaction. The addition of CalypsoAI's platform brings real-time threat defense, red teaming at scale, and data security to enterprises racing to deploy generative and agentic AI. These capabilities will be integrated into the F5 ADSP to create an enhanced solution for securing AI inference.
As a result of the acquisition, the Company acquired all the assets and assumed all the liabilities of CalypsoAI. The goodwill related to the CalypsoAI acquisition is comprised primarily of expected synergies from combining operations and the acquired intangible assets that do not qualify for separate recognition. Goodwill related to the CalypsoAI acquisition was not deductible for tax purposes. Transaction costs associated with the acquisition were not material.
The allocated purchase consideration to assets acquired and liabilities assumed based on preliminary estimated fair values is presented in the following table (in thousands):
Other net tangible assets acquired, at fair value$14,151 
Identifiable intangible assets, developed technology
16,900 
Goodwill114,156 
Total net assets acquired
$145,207 
The initial allocation of the purchase price was based on preliminary valuations and assumptions and is subject to change within the measurement period. The Company expects to finalize the allocation of the purchase price as soon as practicable and no later than one year from the acquisition date.
The developed technology intangible assets are amortized on a straight-line basis over the weighted average estimated useful life of 4.21 years and included in cost of net product revenues. The estimated useful lives for the acquired intangible assets were based on the expected future cash flows associated with the respective asset.
The pro forma financial information, as well as the revenue and earnings generated by CalypsoAI, were not material to the Company's operations for the periods presented.
Other Fiscal Year 2025 Acquisitions
During the second, third and fourth quarters of fiscal 2025, the Company completed three additional acquisitions. The acquired assets and assumed liabilities of the acquisitions were not material and the Company recorded $17.4 million of goodwill as a result of the acquisitions. The acquisitions did not have a material impact to the Company's operating results.
Fiscal Year 2024 Acquisitions
During the second quarter of fiscal 2024, the Company completed two acquisitions. The acquired assets and assumed liabilities of the acquisitions were not material and the Company recorded $23.6 million of goodwill as a result of the acquisitions. The measurement period for the two acquisitions lapsed during the second quarter of fiscal 2025. The Company recorded an immaterial adjustment to consideration exchanged for the purchase of the acquired companies within the post-close measurement period. The acquisitions did not have a material impact to the Company's operating results.
Fiscal Year 2023 Acquisition
In February 2023, the Company acquired Lilac Cloud, Inc. ("Lilac"), a provider of innovative application delivery services. The acquired assets and assumed liabilities of Lilac were not material. The Company recorded $29.4 million of goodwill as a result of the acquisition. The measurement period for the Lilac acquisition lapsed during the second quarter of fiscal 2024. The acquisition did not have a material impact to the Company's operating results.