Discount rate under the Employee Stock Purchase Plan.

Name:	rost_DiscountRateUnderEmployeeStockPurchasePlan
Namespace Prefix:	rost
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares subject to repurchase related to unvested restricted stock, for the period ending.

+ Details

Name:	rost_NumberOfSharesSubjectToRepurchaseRelatedToUnvestedRestrictedStockForPeriodEnding
Namespace Prefix:	rost
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Plan participant's dollar amount ceiling for Employee Stock Purchase Plan contributions.

+ Details

Name:	rost_PlanParticipantsAnnualDollarAmountCeilingForEmployeeStockPurchasePlan
Namespace Prefix:	rost
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Plan Participants Annual Percentage Ceiling For Employee Stock Purchase Plan contributions.

+ Details

Name:	rost_PlanParticipantsAnnualPercentageCeilingForEmployeeStockPurchasePlan
Namespace Prefix:	rost
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase price for shares under the Employee Stock Purchase Plan.

+ Details

Name:	rost_PurchasePriceForSharesUnderEmployeeStockPurchasePlan
Namespace Prefix:	rost
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition
Namespace Prefix:	us-gaap
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod
Namespace Prefix:	us-gaap
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended						6 Months Ended
Stock-Based Compensation (Narrative) (Details) (USD $)	Jul. 30, 2011	Jul. 30, 2011 Restricted Stock [Member]	Jul. 30, 2011 Restricted Stock [Member] Minimum [Member]	Jul. 30, 2011 Restricted Stock [Member] Maximum [Member]	Jul. 30, 2011 Performance Share Awards [Member]	Jan. 29, 2011 Performance Share Awards [Member]	Jul. 31, 2010 Performance Share Awards [Member]	Jul. 30, 2011 Performance Share Awards [Member] Maximum [Member]	Jul. 30, 2011 Employee Stock Purchase Plan ("ESPP") [Member]
Vesting period, (in years)			three	five				three
Treasury stock shares acquired	200,000
Number of shares subject to repurchase related to unvested restricted stock, for the period ending		2,800,000
Unamortized compensation expense					$ 80,300,000	$ 56,800,000	$ 69,900,000
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition (in years)					2.3
Plan participant's annual percentage ceiling for ESPP									10.00%
Plan participant's annual dollar amount ceiling for ESPP, base earnings withheld									$ 21,250
Purchase price for shares under the ESPP									85.00%
Discount rate under the ESPP									15.00%