Contingencies (Details) ¥ in Millions, $ in Millions		3 Months Ended		12 Months Ended
	Jan. 03, 2022 complaint	Dec. 02, 2021 CNY (¥) patent complaint agreement	Dec. 02, 2021 USD ($) patent complaint agreement	Aug. 30, 2018
Securities Matters | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		2	2
MLC Intellectual Property, LLC vs Micron | Patent Matters | Dismissed Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		1	1
Loss Contingency, Claims Dismissed, Number		1	1
Innovative Memory Solutions, Inc. vs Micron-Complaint 1 | Patent Matters
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		8	8
Loss Contingency, Patents Found Not Infringed, Number | patent		6	6
Innovative Memory Solutions, Inc. vs Micron-Complaint 1 | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		2	2
Loss Contingency, Pending Claims, Number		1	1
Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 1 | Patent Matters | Pending Litigation
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
Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 2 | Patent Matters | Pending Litigation
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
United Microelectronics Corporation vs Micron-Complaint 1 | Patent Matters | Withdrawn Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		1	1
Damages sought on alleged patent infringement | ¥		¥ 90
Loss Contingency, Claims Dismissed, Number		1	1
United Microelectronics Corporation vs Micron-Complaint 2 | Patent Matters | Withdrawn Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		1	1
Damages sought on alleged patent infringement | ¥		¥ 90
Loss Contingency, Claims Dismissed, Number		1	1
Fuzhou Court Preliminary Injunction | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Percent of annualized revenue derived from impacted products				1.00%
Flash-Control, LLC vs Micron | Patent Matters
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		4	4
Loss Contingency, Patents Found Not Infringed, Number | patent		2	2
Flash-Control, LLC vs Micron | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		1	1
Netlist Inc. vs Micron | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		1	1
Loss Contingency, Pending Claims, Number		1	1
Netlist Inc vs Micron - Complaint 2 | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		3	3
Loss Contingency, Pending Claims, Number		1	1
Vervain LLC vs Micron | Patent Matters | Pending Litigation
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent		4	4
Loss Contingency, Pending Claims, Number		1	1
Qimonda AG Inotera Share Purchase Proceedings | Under Appeal
Loss Contingencies [Line Items]
Percentage of total Inotera shares subject to litigation (in hundredths)		18.00%	18.00%
Loss contingency, judgment under appeal | $			$ 1
Claims on Behalf of Indirect Purchasers | Antitrust Matters | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		1	1
Subsequent indirect DRAM Purchasers United States vs Micron | Antitrust Matters | Dismissed Litigation
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number		2	2
Subsequent direct DRAM Purchasers United States vs Micron | Antitrust Matters | Dismissed Litigation
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number		4	4
Claims on Behalf of Direct Purchasers | Antitrust Matters | Under Appeal
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number		1	1
DRAM Purchasers Canada vs Micron | Antitrust Matters | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		6	6
Micron Vs Fujian Jinhua | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		1	1
Micron Vs United Microelectronics Corporation | Dismissed Litigation | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number	1
Employee Class Action vs Micron | Under Appeal
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		1	1
Micron Intel JV Arbitration Matter | Minimum | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Agreements Allegedly Breached, Number | agreement		1	1
Allied Telesis K.K. vs Micron | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		1	1