Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Derivative Instruments - (Details)	12 Months Ended
Derivative Instruments - (Details)	Sep. 30, 2020 USD ($) instrument	Sep. 30, 2018 USD ($)	Jul. 31, 2017 USD ($) derivative
Derivative Instruments
Number of derivative instruments held \| instrument	0
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
Interest rate caps designated as cash flow hedges to be reclassified in to interest expense over next 12 months	$ 1,200,000
Reclassified loss from AOCL, net	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	600,000
Foreign currency forwards designated as cash flow hedges to be reclassified in to cost of goods sold	$ 1,100,000
Selling, General and Administrative Expenses \| Non-Designated \| Foreign Exchange Contract
Derivative Instruments
Gain (loss) on derivative instrument		$ 1,600,000