Segment Reporting - Schedule of Disaggregation of Net Sales by Segment (Details) - Sales Revenue, Net - Product Concentration Risk	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Sally
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Sally \| Hair color
Disaggregation Of Revenue [Line Items]
Percentage of net sales	45.10%	42.30%	44.00%	41.30%
Sally \| Hair care
Disaggregation Of Revenue [Line Items]
Percentage of net sales	21.50%	23.60%	21.80%	23.70%
Sally \| Styling tools and supplies
Disaggregation Of Revenue [Line Items]
Percentage of net sales	16.10%	16.20%	16.70%	16.80%
Sally \| Nail
Disaggregation Of Revenue [Line Items]
Percentage of net sales	9.90%	10.00%	9.90%	10.00%
Sally \| Skin and cosmetics
Disaggregation Of Revenue [Line Items]
Percentage of net sales	7.10%	7.40%	7.30%	7.60%
Sally \| Other Beauty items
Disaggregation Of Revenue [Line Items]
Percentage of net sales	0.30%	0.50%	0.30%	0.60%
Sally \| Sales channel, directly to consumer \| Company-operated stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	90.30%	91.80%	90.40%	92.00%
Sally \| Sales channel, through intermediary \| E-commerce
Disaggregation Of Revenue [Line Items]
Percentage of net sales	9.70%	8.20%	9.60%	8.00%
BSG
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
BSG \| Hair color
Disaggregation Of Revenue [Line Items]
Percentage of net sales	43.80%	42.80%	42.70%	41.40%
BSG \| Hair care
Disaggregation Of Revenue [Line Items]
Percentage of net sales	40.80%	40.90%	41.80%	41.90%
BSG \| Styling tools and supplies
Disaggregation Of Revenue [Line Items]
Percentage of net sales	10.10%	10.50%	10.10%	10.60%
BSG \| Nail
Disaggregation Of Revenue [Line Items]
Percentage of net sales	2.10%	2.20%	2.00%	2.30%
BSG \| Skin and cosmetics
Disaggregation Of Revenue [Line Items]
Percentage of net sales	2.90%	3.40%	3.20%	3.60%
BSG \| Other Beauty items
Disaggregation Of Revenue [Line Items]
Percentage of net sales	0.30%	0.20%	0.20%	0.20%
BSG \| Sales channel, directly to consumer \| Company-operated stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	69.30%	69.30%	69.30%	69.40%
BSG \| Sales channel, through intermediary \| E-commerce
Disaggregation Of Revenue [Line Items]
Percentage of net sales	14.90%	13.90%	14.80%	14.00%
BSG \| Sales channel, through intermediary \| Salon business consultants
Disaggregation Of Revenue [Line Items]
Percentage of net sales	8.40%	9.30%	8.50%	9.50%
BSG \| Sales channel, through intermediary \| Franchise stores
Disaggregation Of Revenue [Line Items]
Percentage of net sales	7.40%	7.50%	7.40%	7.10%