v2.4.1.9
Equity - Capped Calls (Details) (Call Option [Member], Purchased options [Member], Convertible Debt [Member], USD $)
 3 Months Ended
Dec. 04, 2014
Minimum [Member]
  
Option Indexed to Issuer's Equity [Line Items]  
Option indexed to issuer's equity, strike price (in dollars per share) $ 9.50us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Option Indexed to Issuer's Equity, capped ceiling $ 0mu_CallOptionIndexedToIssuersEquityCappedCeiling
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]
  
Option Indexed to Issuer's Equity [Line Items]  
Option indexed to issuer's equity, strike price (in dollars per share) $ 10.93us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Option Indexed to Issuer's Equity, capped ceiling $ 864,000,000mu_CallOptionIndexedToIssuersEquityCappedCeiling
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember