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Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Restructuring (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Changes in restructuring reserve
Gain on sale of properties		$ 6,548	$ (42)
Supply Chain Modernization
Changes in restructuring reserve
Restructuring charges		833
Cash Payments		680
Restructuring reserve, ending balance		153
Supply Chain Modernization \| Secondary Headquarters and Fulfillment Center
Changes in restructuring reserve
Gain on sale of properties		6,600
Supply Chain Modernization \| Sally Beauty Supply
Changes in restructuring reserve
Restructuring charges		600
2018 Restructuring Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance		8,797
Restructuring charges	$ 6,759	3,980	$ 11,969
Cash Payments		12,619
Restructuring reserve, ending balance		158
2018 Restructuring Plan \| Corporate
Changes in restructuring reserve
Restructuring charges		2,800
2018 Restructuring Plan \| Sally Beauty Supply
Changes in restructuring reserve
Restructuring charges		1,100
Workforce reductions \| Supply Chain Modernization
Changes in restructuring reserve
Restructuring charges		236
Cash Payments		83
Restructuring reserve, ending balance		153
Workforce reductions \| 2018 Restructuring Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance		3,444
Restructuring charges		643
Cash Payments		4,087
Facility Closures \| Supply Chain Modernization
Changes in restructuring reserve
Restructuring charges		502
Cash Payments		502
Other \| Supply Chain Modernization
Changes in restructuring reserve
Restructuring charges		95
Cash Payments		95
Other \| 2018 Restructuring Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance		2,266
Restructuring charges		835
Cash Payments		2,943
Restructuring reserve, ending balance		158
Consulting \| 2018 Restructuring Plan
Changes in restructuring reserve
Restructuring reserve, beginning balance		3,087
Restructuring charges		2,502
Cash Payments		$ 5,589