Significant Accounting Policies (Policies)	6 Months Ended
Mar. 04, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying consolidated financial statements include the accounts of Micron and our consolidated subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) consistent in all material respects with those applied in our Annual Report on Form 10-K for the year ended September 3, 2020, except for changes in accounting and presentation of inventories. See “Inventories” below for changes to our significant accounting policies, and the “Inventories” note for additional information.
Reclassifications	Certain reclassifications have been made to prior period amounts to conform to current period presentation.
Fiscal Period	Our fiscal year is the 52 or 53-week period ending on the Thursday closest to August 31. Fiscal 2021 contains 52 weeks and our fiscal 2020 contained 53 weeks. The first and second quarters of fiscal 2021 and 2020 each contained 13 weeks. All period references are to our fiscal periods unless otherwise indicated.
Variable Interest Entities	Through October 31, 2019, IMFT was a consolidated variable interest entity. We acquired Intel’s noncontrolling interest in IMFT on October 31, 2019, at which time IMFT became a wholly-owned subsidiary.
Inventories	Inventories Effective as of the beginning of the second quarter of 2021, we changed the method of inventory costing from average cost to first-in, first-out (“FIFO”). The difference between average cost and FIFO was not material to any previously reported financial statements. Therefore, we have recognized the cumulative effect of the change as a reduction of inventories and a charge to cost of goods sold of $133 million as of the beginning of the second quarter of 2021. Inventories are stated at the lower of cost or net realizable value, with cost being determined on a FIFO basis. Cost includes depreciation, labor, material, and overhead costs, including product and process technology costs. When net realizable value (which requires projecting future average selling prices, sales volumes, and costs to complete products in work in process inventories) is below cost, we record a charge to cost of goods sold to write down inventories to their estimated net realizable value in advance of when inventories are actually sold. We review the major characteristics of product type and markets in determining the unit of account for which we perform the lower of average cost or net realizable value analysis and categorize all inventories (including DRAM, NAND, and other memory) as a single group. We remove amounts from inventory and charge such amounts to cost of goods sold on a FIFO basis.

Significant Accounting Policies (Policies)

6 Months Ended

Mar. 04, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying consolidated financial statements include the accounts of Micron and our consolidated subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) consistent in all material respects with those applied in our Annual Report on Form 10-K for the year ended September 3, 2020, except for changes in accounting and presentation of inventories. See “Inventories” below for changes to our significant accounting policies, and the “Inventories” note for additional information.

Reclassifications

Certain reclassifications have been made to prior period amounts to conform to current period presentation.

Fiscal Period

Our fiscal year is the 52 or 53-week period ending on the Thursday closest to August 31. Fiscal 2021 contains 52 weeks and our fiscal 2020 contained 53 weeks. The first and second quarters of fiscal 2021 and 2020 each contained 13 weeks. All period references are to our fiscal periods unless otherwise indicated.

Variable Interest Entities

Through October 31, 2019, IMFT was a consolidated variable interest entity. We acquired Intel’s noncontrolling interest in IMFT on October 31, 2019, at which time IMFT became a wholly-owned subsidiary.

Inventories

Effective as of the beginning of the second quarter of 2021, we changed the method of inventory costing from average cost to first-in, first-out (“FIFO”). The difference between average cost and FIFO was not material to any previously reported financial statements. Therefore, we have recognized the cumulative effect of the change as a reduction of inventories and a charge to cost of goods sold of $133 million as of the beginning of the second quarter of 2021.

Inventories are stated at the lower of cost or net realizable value, with cost being determined on a FIFO basis. Cost includes depreciation, labor, material, and overhead costs, including product and process technology costs. When net realizable value (which requires projecting future average selling prices, sales volumes, and costs to complete products in work in process inventories) is below cost, we record a charge to cost of goods sold to write down inventories to their estimated net realizable value in advance of when inventories are actually sold. We review the major characteristics of product type and markets in determining the unit of account for which we perform the lower of average cost or net realizable value analysis and categorize all inventories (including DRAM, NAND, and other memory) as a single group. We remove amounts from inventory and charge such amounts to cost of goods sold on a FIFO basis.