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Summary of Significant Accounting Policies (Nature of Business) (Details)	Jul. 30, 2016 USD ($) Store state	Aug. 01, 2015 Store
Accounting Policies [Abstract]
Products offering price, maximum price | $	$ 5
Number of States in which Entity Operates | state	30
Number of Stores	491
Number of operated stores		417

X

- Definition

Number Of Company Operated Stores

+ References

No definition available.

+ Details

Name:	five_NumberOfCompanyOperatedStores
Namespace Prefix:	five_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Products Offering Price

+ References

No definition available.

+ Details

Name:	five_ProductsOfferingPrice
Namespace Prefix:	five_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant