Business Segments - Schedule of Disaggregation of Net Sales by Segment (Details) - Sales Revenue, Net - Product Concentration Risk	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Sally Beauty Supply
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Sally Beauty Supply | Hair color
Disaggregation Of Revenue [Line Items]
Percentage of net sales	38.10%	35.80%	37.40%	35.90%
Sally Beauty Supply | Hair care
Disaggregation Of Revenue [Line Items]
Percentage of net sales	24.10%	21.70%	24.00%	21.40%
Sally Beauty Supply | Styling tools and supplies
Disaggregation Of Revenue [Line Items]
Percentage of net sales	19.20%	22.80%	19.70%	22.90%
Sally Beauty Supply | Nail
Disaggregation Of Revenue [Line Items]
Percentage of net sales	10.60%	10.70%	10.50%	10.80%
Sally Beauty Supply | Skin and cosmetics
Disaggregation Of Revenue [Line Items]
Percentage of net sales	7.40%	8.30%	7.70%	8.30%
Sally Beauty Supply | Other Beauty items
Disaggregation Of Revenue [Line Items]
Percentage of net sales	0.60%	0.70%	0.70%	0.70%
Sally Beauty Supply | Sales channel, directly to consumer | Company-operated stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	93.70%	93.00%	94.00%	93.50%
Sally Beauty Supply | Sales channel, through intermediary | E-commerce
Disaggregation Of Revenue [Line Items]
Percentage of net sales	6.30%	6.90%	6.00%	6.50%
Sally Beauty Supply | Sales channel, through intermediary | Franchise stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	0.00%	0.10%	0.00%	0.00%
Beauty Systems Group
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Beauty Systems Group | Hair color
Disaggregation Of Revenue [Line Items]
Percentage of net sales	42.70%	42.60%	42.40%	41.40%
Beauty Systems Group | Hair care
Disaggregation Of Revenue [Line Items]
Percentage of net sales	39.90%	38.80%	39.90%	39.00%
Beauty Systems Group | Styling tools and supplies
Disaggregation Of Revenue [Line Items]
Percentage of net sales	11.20%	11.20%	11.30%	11.80%
Beauty Systems Group | Nail
Disaggregation Of Revenue [Line Items]
Percentage of net sales	2.30%	2.90%	2.10%	3.10%
Beauty Systems Group | Skin and cosmetics
Disaggregation Of Revenue [Line Items]
Percentage of net sales	3.50%	4.00%	4.00%	4.30%
Beauty Systems Group | Other Beauty items
Disaggregation Of Revenue [Line Items]
Percentage of net sales	0.40%	0.50%	0.30%	0.40%
Beauty Systems Group | Sales channel, directly to consumer | Company-operated stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	66.60%	70.20%	67.10%	69.90%
Beauty Systems Group | Sales channel, through intermediary | Distributor sales consultants
Disaggregation Of Revenue [Line Items]
Percentage of net sales	14.00%	13.70%	13.80%	14.00%
Beauty Systems Group | Sales channel, through intermediary | E-commerce
Disaggregation Of Revenue [Line Items]
Percentage of net sales	12.40%	9.10%	12.00%	8.80%
Beauty Systems Group | Sales channel, through intermediary | Franchise stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	7.00%	7.00%	7.10%	7.30%