Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Net sales:
Total net sales	$ 980,208	$ 989,453
Segment operating earnings:
Segment operating earnings	94,387	109,738
Restructuring charges	2,531	3,980
Interest expense	21,541	24,489
Earnings before provision for income taxes	72,846	85,249
Operating segments
Segment operating earnings:
Segment operating earnings	136,659	152,321
Corporate
Segment operating earnings:
Unallocated expenses	39,741	38,603
Sally Beauty Supply
Net sales:
Total net sales	569,147	580,608
Sally Beauty Supply \| Operating segments
Segment operating earnings:
Segment operating earnings	74,225	89,991
Beauty Systems Group
Net sales:
Total net sales	411,061	408,845
Beauty Systems Group \| Operating segments
Segment operating earnings:
Segment operating earnings	$ 62,434	$ 62,330

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