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Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Restructuring (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Changes in restructuring reserve
Restructuring charges	$ 3,193	$ (5,814)	$ 5,725	$ (1,834)
Corporate
Changes in restructuring reserve
Restructuring charges			2,400
Sally Beauty Supply
Changes in restructuring reserve
Restructuring charges			1,300
Beauty Systems Group
Changes in restructuring reserve
Restructuring charges			700
Project Surge
Changes in restructuring reserve
Restructuring charges			1,360
Expenses Paid or Otherwise Settled			1,360
Project Surge \| Corporate
Changes in restructuring reserve
Restructuring charges			100
Project Surge \| Sally Beauty Supply
Changes in restructuring reserve
Restructuring charges			1,300
Transformation Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance			928
Restructuring charges	3,086	$ (5,814)	4,365	$ (1,834)
Expenses Paid or Otherwise Settled			4,576
Restructuring reserve, ending balance	717		717
Workforce reductions \| Project Surge
Changes in restructuring reserve
Restructuring charges			998
Expenses Paid or Otherwise Settled			998
Workforce reductions \| Transformation Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance			654
Restructuring charges			2,022
Expenses Paid or Otherwise Settled			1,959
Restructuring reserve, ending balance	$ 717		717
Other \| Project Surge
Changes in restructuring reserve
Restructuring charges			362
Expenses Paid or Otherwise Settled			362
Other \| Transformation Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance			70
Restructuring charges			917
Expenses Paid or Otherwise Settled			987
Consulting \| Transformation Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance			204
Restructuring charges			1,426
Expenses Paid or Otherwise Settled			$ 1,630