Goodwill and Intangible Assets - Schedule of changes in carrying amounts of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Change in the carrying amounts of goodwill
Balance at the beginning of the period	$ 535,925	$ 537,791
Acquisitions	284	1,045
Foreign currency translation	(5,423)	(2,911)
Balance at the end of the period	530,786	535,925
Sally Beauty Supply
Change in the carrying amounts of goodwill
Balance at the beginning of the period	81,217	82,670
Acquisitions	284	329
Foreign currency translation	(4,596)	(1,782)
Balance at the end of the period	76,905	81,217
Beauty Systems Group
Change in the carrying amounts of goodwill
Balance at the beginning of the period	454,708	455,121
Acquisitions		716
Foreign currency translation	(827)	(1,129)
Balance at the end of the period	$ 453,881	$ 454,708