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Derivative Instruments - (Details)	12 Months Ended
Derivative Instruments - (Details)	Sep. 30, 2019 USD ($) instrument derivative	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jul. 31, 2017 USD ($) derivative
Derivative Instruments
Number of derivative instruments held \| instrument	0
Repayment of debt	$ 777,538,000	$ 558,599,000	$ 1,216,643,000
Interest rate caps \| Variable-rate tranche \| Sally Holdings, LLC
Derivative Instruments
Notional Amount				$ 550,000,000
Derivative instruments, expiration date	Jun. 30, 2023
Number of interest rate caps \| derivative				2
Interest rate caps \| Term loan B variable tranche \| Sally Holdings, LLC
Derivative Instruments
Notional Amount	$ 115,000,000.0
Number of interest rate caps \| derivative	1
Repayment of debt	$ 115,000,000.0
Debt principal amount	115,000,000.0
Reclassified loss from AOCL	1,200,000
Interest rate caps designated as cash flow hedges to be reclassified in to interest expense over next 12 months	600,000
Reclassified loss from AOCL, net	1,600,000
Reclassification out of Accumulated Other Comprehensive Income \| Foreign Exchange Contract
Derivative Instruments
Foreign currency forwards designated as cash flow hedges to be reclassified in to cost of goods sold over next 12 months	300,000
Foreign currency forwards designated as cash flow hedges to be reclassified in to cost of goods sold	$ 700,000
Selling, General and Administrative Expenses \| Non-Designated \| Foreign Exchange Contract
Derivative Instruments
Gain (loss) on derivative instrument		$ 1,600,000	$ (2,800,000)