Contingencies (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Sep. 03, 2020 CNY (¥) lawsuit patent agreement	Sep. 03, 2020 USD ($) lawsuit patent agreement	Aug. 30, 2018
Pending Litigation | Qimonda AG Inotera Share Purchase Proceedings
Loss Contingencies [Line Items]
Percentage of total Inotera shares subject to litigation (in hundredths)	18.00%	18.00%
Loss contingency, judgment under appeal | $		$ 1
Loss Contingency, Pending Claims, Number	1	1
Pending Litigation | Micron vs United Microelectronics Corp and Fujian Jinhua Integrated Circuit Co
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	1	1
Pending Litigation | Micron Intel JV Arbitration Matter [Member] | Minimum
Loss Contingencies [Line Items]
Loss Contingency, Agreements Allegedly Breached, Number | agreement	1	1
Under Appeal | Employee Class Action vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | MLC Intellectual Property, LLC vs Micron
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | Elm 3DS Innovations, LLC vs Micron
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	13	13
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | Innovative Memory Solutions, Inc. vs Micron-Complaint 1
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	8	8
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 1
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 98
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 2
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 98
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | United Microelectronics Corporation vs Micron-Complaint 1
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 90
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | United Microelectronics Corporation vs Micron-Complaint 2
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 90
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Pending Litigation | Fuzhou Court Preliminary Injunction
Loss Contingencies [Line Items]
Percent of annualized revenue derived from impacted products			1.00%
Patent Matters | Pending Litigation | Flash-Control, LLC vs Micron
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	4	4
Loss Contingency, Pending Claims, Number	1	1
Patent Matters | Withdrawn Litigation | Innovative Memory Solutions, Inc. vs Micron-Complaint 3
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 21
Loss Contingency, Claims Withdrawn, Number	1	1
Patent Matters | Withdrawn Litigation | United Microelectronics Corporation vs Micron-Complaint 3
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent	1	1
Damages sought on alleged patent infringement | ¥	¥ 90
Loss Contingency, Claims Withdrawn, Number	1	1
Antitrust Matters | Pending Litigation | Consolidated Amended Indirect Purchasers CA vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	1	1
Antitrust Matters | Pending Litigation | Consolidated Amended Direct Purchasers CA vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	1	1
Antitrust Matters | Pending Litigation | DRAM Purchasers Canada vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	6	6
Antitrust Matters | Joined Litigation | Initial direct DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Joined, Number	1	1
Antitrust Matters | Joined Litigation | Subsequent direct DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Joined, Number	4	4
Antitrust Matters | Dismissed Litigation | Initial indirect DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number	1	1
Antitrust Matters | Dismissed Litigation | Subsequent indirect DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number	2	2
Securities Matters | Pending Litigation | Shareholder Class Action Delaware Court vs Micron.
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	1	1
Securities Matters | Joined Litigation | Original Shareholder Action New York vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Joined, Number	1	1
Securities Matters | Joined Litigation | Subsequent Shareholder Claims New York vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Joined, Number	2	2
Securities Matters | Dismissed Litigation | Consolidated Shareholder Class Action New York Court vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number	1	1
Securities Matters | Withdrawn Litigation | Shareholder Derivative Complaint Delaware Court 2
Loss Contingencies [Line Items]
Loss Contingency, Claims Withdrawn, Number	1	1
Securities Matters | Withdrawn Litigation | Shareholder Derivative Complaint Idaho Court
Loss Contingencies [Line Items]
Loss Contingency, Claims Withdrawn, Number	1	1