Description of Business	12 Months Ended
Description of Business	Jul. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Stitch Fix, Inc. (“we,” “our,” “us,” or “the Company”) delivers personalization to our clients through the pairing of data science and human judgment. Currently, clients can engage with us in one of two ways that, combined, form an ecosystem of personalized experiences across styling, shopping and inspiration: (1) by receiving a personalized shipment of apparel informed by our algorithms and sent by a Stitch Fix stylist (a “Fix”); or (2) by purchasing directly from our website or mobile app based on a personalized assortment of outfit and item recommendations (“Freestyle”). Clients can choose to schedule automatic shipments or order a Fix on demand after they fill out a style profile on our website or mobile app. After receiving a Fix, our clients purchase the items they want to keep and return the other items, if any. Freestyle utilizes our algorithms to recommend a personalized assortment of outfit and item recommendations that will update throughout the day and will continue to evolve as we learn more about the client. We are incorporated in Delaware and have operations in the United States and the UK. COVID-19 Update There continues to be uncertainty around the COVID-19 pandemic as the Delta variant of COVID-19, which appears to be the most transmissible and contagious variant to date, has caused a surge in COVID-19 cases globally. The full impact of the COVID-19 crisis on our business will depend on factors such as the length of time of the pandemic; how federal, state and local governments are responding, especially in light of the recent surge in cases due to the Delta variant; vaccination rates among the population; the efficacy of the COVID-19 vaccines against the Delta variant and other variants as they emerge; the longer-term impact of the crisis on the economy and consumer behavior; and the effect on our clients, employees, vendors, and other partners. As a result of the COVID-19 pandemic, in the third quarter of fiscal 2020, we temporarily closed three of our fulfillment centers, operated at significantly reduced capacity for much of the third quarter of fiscal 2020 as a result of such temporary closures, and reduced our marketing in light of this reduced capacity. During the fourth quarter of fiscal 2020, our fulfillment centers returned to higher capacity levels. During fiscal 2021, we experienced smaller, intermittent interruptions at our fulfillment centers when we temporarily closed for part of a work day or for a full day to perform safety and cleaning procedures following an employee testing positive for COVID-19. We believe our financial resources will allow us to manage the impact of COVID-19 on our business and operations. We believe our existing cash, cash equivalents, and short-term investment balances, and the borrowing available under our Amended Credit Agreement, if needed, will be sufficient to meet our working capital and capital expenditure needs for at least the next 12 months. We also do not anticipate any impairments with respect to long-lived assets or short-term and long-term investments that would have a material impact on our financial statements. Coronavirus Aid, Relief, and Economic Security Act On March 27, 2020, the U.S. enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), which among other things, permits net operating loss (“NOL”) carryovers and carrybacks to offset 100% of taxable income for tax years beginning before 2021 and allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. We provided for an estimated effect of the CARES Act in our financial statements for the period ended July 31, 2021.