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Summary of Significant Accounting Policies (Nature of Business) (Details)	Aug. 03, 2019 USD ($) state Stores	Aug. 04, 2018 Stores
Accounting Policies [Abstract]
Products offering price, maximum price | $	$ 5
Number of states in which entity operates (state) | state	36
Number of stores (store) | Stores	833	692

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