Derivative Instruments and Hedging Activities - (Details)	6 Months Ended
Mar. 31, 2019 USD ($) instrument	Jul. 31, 2017 USD ($) derivative
Derivative Instruments
Number of derivative instruments held \| instrument	0
Foreign Currency Forwards
Derivative Instruments
Notional Amount	$ 38,244,000
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 designated as cash flow hedges to be reclassified in to interest expense over next 12 months	$ 500,000
Reclassification from AOCL \| Foreign Currency Forwards
Derivative Instruments
Foreign currency forwards designated as cash flow hedges to be reclassified in to cost of goods sold over next 12 months	$ 500,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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.

+ References

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- Definition

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

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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- Definition

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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- Definition

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

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