XML 41 R26.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies (Fiscal Year) (Details) | 12 Months Ended
--- | ---
Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Accounting Policies [Abstract] |  |  |
Fiscal year period | 364 days | 364 days | 364 days

X
- Definition Fiscal Year Period + References No definition available. + Details
Name: | five_FiscalYearPeriod
Namespace Prefix: | five_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration