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Contingencies (Details)
¥ in Millions, $ in Millions
6 Months Ended
Mar. 21, 2018
CNY (¥)
Mar. 19, 2018
CNY (¥)
Mar. 01, 2018
USD ($)
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%
Loss contingency, judgment under appeal | $     $ 1
Patent Matters | Pending Litigation | Elm 3DS Innovations, LLC      
Loss Contingencies [Line Items]      
Number of patents allegedly infringed     13
Patent Matters | Pending Litigation | Innovative Memory Solutions, Inc.      
Loss Contingencies [Line Items]      
Number of patents allegedly infringed     8
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd.      
Loss Contingencies [Line Items]      
Number of patents allegedly infringed     1
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd. | Subsequent Event      
Loss Contingencies [Line Items]      
Damages sought from MXA by Jinhua | ¥   ¥ 98  
Patent Matters | Pending Litigation | United Microelectronics Corporation      
Loss Contingencies [Line Items]      
Number of patents allegedly infringed     1
Patent Matters | Pending Litigation | United Microelectronics Corporation | Subsequent Event      
Loss Contingencies [Line Items]      
Damages sought from MXA by Jinhua | ¥ ¥ 90    
Patent Matters | Settled Litigation [Member] | Harvard University [Member]      
Loss Contingencies [Line Items]      
Number of patents allegedly infringed     2