Description of Business	6 Months Ended
Description of Business	Jan. 30, 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 one-to-one personalization to our clients through the combination of data science and human judgment. Our stylists hand select items from a broad range of merchandise. Stylists pair their own judgment with our analysis of client and merchandise data to provide a personalized shipment of apparel, shoes, and accessories suited to each client’s needs. We call each of these unique shipments a Fix. After receiving a Fix, our clients purchase the items they want to keep and return the other items. We also provide a direct-buy offering that allows clients the flexibility of purchasing items outside of a Fix. Through direct buy, clients are offered previously purchased items in different colors, sizes, or prints, as well as a personalized set of algorithmically generated items based on their prior purchases or style preferences. We are incorporated in Delaware and have operations in the United States and the United Kingdom (“UK”). COVID-19 Update We are closely monitoring the effects of the ongoing coronavirus (“COVID-19”) outbreak and its impact on our business. 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; the efficacy of the COVID-19 vaccines, the efficiency of vaccines roll-outs and timing of when these vaccines will be widely available to our employees and the general population; 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 eight fulfillment centers, operated at significantly reduced capacity for much of the third quarter 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. In the first and second quarters of 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 senior revolving credit facility, 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 January 30, 2021.