Shareholders' Equity Shareholders' Equity - Issuance for Acquisition of Numonyx (Details) (Numonyx Holdings B V [Member]) In Millions	12 Months Ended
Sep. 01, 2011	May 07, 2010
Common stock [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity units issued for acquisition of Numonyx (in shares)		137.7
Shares held in escrow for indemnity obligations (in shares)		21.0
Shares held in escrow for indemnity obligations sold (in shares)	21.0
Restricted stock units [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity units issued for acquisition of Numonyx (in shares)		4.8
Restricted stock units vested at time of issuance (in shares)		1.6

Number of shares of equity interests issued or issuable to acquire entity.

Name:	mu_BusinessAcquisitionEquityInterestIssuedOrIssuableNumberOfSharesIssuedOnAcquisitionDate
Namespace Prefix:	mu
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

+ Details

Name:	mu_ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedUponAcquisition
Namespace Prefix:	mu
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Sumber of shares held in escrow as partial security for Numonyx shareholders' indeminity obligations.

+ Details

Name:	mu_SharesHeldInEscrowForIndeminityObligations
Namespace Prefix:	mu
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares held in escrow as partial security for Numonyx shareholders' indeminity obligations that were sold during the period.

+ Details

Name:	mu_SharesHeldInEscrowForIndeminityObligationsSold
Namespace Prefix:	mu
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration