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Segment Information
 3 Months Ended
Jan. 31, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
Reportable Segments
We have two reportable segments: semiconductor solutions and infrastructure software. Each segment represents components for which separate financial information is available that is utilized on a regular basis by the CODM in determining how to allocate resources and evaluate performance. The reportable segments are determined based on several factors including, but not limited to, customer base, homogeneity of products, technology, delivery channels and similar economic characteristics.
Semiconductor solutions. We provide semiconductor solutions for managing the movement of data in data center, telecom, enterprise and embedded networking applications. We provide a broad variety of radio frequency semiconductor devices, wireless connectivity solutions and custom touch controllers for mobile applications. We also provide semiconductor solutions for enabling the set-top box and broadband access markets and for enabling secure movement of digital data to and from host machines, such as servers, personal computers and storage systems, to the underlying storage devices, such as hard disk drives and solid state drives. We also provide a broad variety of products for the general industrial and automotive markets. Our semiconductor solutions segment also includes our IP licensing.
Infrastructure software. We provide a portfolio of software solutions that enables customers to plan, develop, automate, manage and secure applications across mainframe, distributed, mobile and cloud platforms. Our portfolio of mainframe and BizOps software solutions enables customers to leverage the benefits of agility, automation, insights, resiliency and security in managing business processes and technology investments. Our cyber security solutions portfolio includes endpoint, network, information and identity security solutions. We also offer mission critical FC SAN products and related software.
Our CODM assesses the performance of each segment and allocates resources to each segment based on net revenue and operating results and does not evaluate each segment using discrete asset information. Operating results by segment include items that are directly attributable to each segment and also include shared expenses such as global operations, including manufacturing support, logistics and quality control, expenses associated with selling, general and administrative activities, facilities and information technology (“IT”) expenses. Shared expenses are primarily allocated based on revenue and headcount.
During the fourth quarter of fiscal year 2020, we refined our allocation methodology for certain selling, general and administrative expenses to more closely align these costs with the segment benefiting from the shared expenses. Prior period segment results have been recast to conform to the current presentation.
Unallocated Expenses
Unallocated expenses include amortization of acquisition-related intangible assets, stock-based compensation expense, restructuring, impairment and disposal charges, acquisition-related costs, charges related to inventory step-up to fair value, and other costs, which are not used in evaluating the results of, or in allocating resources to, our segments. Acquisition-related costs include transaction costs and any costs directly related to the acquisition and integration of acquired businesses.
Depreciation expense directly attributable to each reportable segment is included in the operating results of each segment. However, the CODM does not evaluate depreciation expense by operating segment and, therefore, it is not separately presented. There was no inter-segment revenue in either of the fiscal quarters ended January 31, 2021 or February 2, 2020. The accounting policies of the segments are the same as those described in the summary of significant accounting policies.
Fiscal Quarter Ended
January 31,
2021		February 2,
2020
(In millions)
Net revenue:
Semiconductor solutions$4,908 $4,191 
Infrastructure software1,747 1,667 
Total net revenue$6,655 $5,858 
Operating income:
Semiconductor solutions$2,561 $2,043 
Infrastructure software1,219 1,041 
Unallocated expenses(1,943)(2,370)
Total operating income$1,837 $714 
Significant Customer Information
We sell our products through our direct sales force and a select network of distributors and channel partners globally. No customer accounted for 10% or more of our net accounts receivable balance as of January 31, 2021 or November 1, 2020.
One customer accounted for 19% and 14% of our net revenue for the fiscal quarters ended January 31, 2021 and February 2, 2020, respectively. Net revenue from this customer was included in our semiconductor solutions segment.