Condensed Consolidated Statements of Comprehensive Income (Parenthetical)	12 Months Ended
Dec. 28, 2017	Dec. 29, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Fiscal year period	364 days	364 days	371 days

The length of the fiscal year, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	fnd_FiscalYearPeriod
Namespace Prefix:	fnd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration