Contingencies (Details) ¥ in Millions, $ in Millions					12 Months Ended
	Oct. 03, 2019 lawsuit	Sep. 03, 2019 lawsuit	Jun. 07, 2019 lawsuit	Oct. 09, 2018 lawsuit	Aug. 29, 2019 USD ($) lawsuit patent	Aug. 29, 2019 CNY (¥) lawsuit patent
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 | 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 | 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 | ¥						¥ 1
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%	1.00%
Patent Matters | Dismissed Litigation | Innovative Memory Solutions, Inc. vs Micron-Complaint 2
Loss Contingencies [Line Items]
Number of patents allegedly infringed | patent					1	1
Loss Contingency, Claims Dismissed, Number			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
Antitrust Matters | Pending Litigation | Initial direct DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number					1	1
Antitrust Matters | Pending Litigation | Subsequent direct DRAM Purchasers United States vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number					4	4
Antitrust Matters | Pending Litigation | DRAM Purchasers Canada vs Micron
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number					6	6
Antitrust Matters | Dismissed Litigation | Initial indirect DRAM Purchasers United States vs Micron | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number		1
Antitrust Matters | Dismissed Litigation | Subsequent indirect DRAM Purchasers United States vs Micron | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number		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 | Subsequent Event
Loss Contingencies [Line Items]
Loss Contingency, Claims Dismissed, Number	1