Parent, Issuers, Guarantor and Non-Guarantor Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Assets
Cash and cash equivalents	$ 57,855			$ 77,295	$ 76,855			$ 63,759
Trade and other accounts receivable, net	96,996			90,490
Inventory	967,744			944,338
Other current assets	37,853			42,960
Property and equipment, net	292,371			308,357
Goodwill and other intangible assets, net	599,405			608,623
Other assets	20,047			25,351
Total assets	2,072,271			2,097,414
Liabilities and Stockholders’ (Deficit) Equity
Accounts payable	272,629			303,241
Accrued liabilities	146,209			180,287
Income taxes payable	1,214			2,144
Long-term debt	1,610,665			1,774,309
Other liabilities	25,709			30,022
Deferred income tax liabilities, net	86,310			75,967
Total liabilities	2,142,736			2,365,970
Total stockholders’ (deficit) equity	(70,465)	$ (145,075)	$ (214,731)	(268,556)	(326,209)	$ (315,029)	$ (342,635)	(363,616)
Total liabilities and stockholders’ (deficit) equity	2,072,271			2,097,414
Parent
Assets
Trade and other accounts receivable, net				4
Other current assets	2,755			2,010
Property and equipment, net	6			8
Investment in subsidiaries	1,563,789			1,368,927
Other assets	1,325			1,325
Total assets	1,567,875			1,372,274
Liabilities and Stockholders’ (Deficit) Equity
Accounts payable	20			38
Due to affiliates	1,631,574			1,629,411
Accrued liabilities	190			234
Income taxes payable	97			585
Other liabilities	6,729			10,562
Deferred income tax liabilities, net	(270)
Total liabilities	1,638,340			1,640,830
Total stockholders’ (deficit) equity	(70,465)			(268,556)
Total liabilities and stockholders’ (deficit) equity	1,567,875			1,372,274
Sally Holdings and Sally Capital
Assets
Cash and cash equivalents	10			10	10			10
Other current assets	88			111
Investment in subsidiaries	4,299,448			4,044,669
Other assets	2,258			10,242
Total assets	4,301,804			4,055,032
Liabilities and Stockholders’ (Deficit) Equity
Due to affiliates	1,118,896			888,141
Accrued liabilities	9,027			23,019
Income taxes payable	1,519			1,519
Long-term debt	1,609,799			1,773,426
Deferred income tax liabilities, net	(1,226)
Total liabilities	2,738,015			2,686,105
Total stockholders’ (deficit) equity	1,563,789			1,368,927
Total liabilities and stockholders’ (deficit) equity	4,301,804			4,055,032
Guarantor Subsidiaries
Assets
Cash and cash equivalents	31,254			29,050	27,386			22,090
Trade and other accounts receivable, net	60,003			53,295
Due from affiliates	2,818,602			2,598,681
Inventory	721,063			714,000
Other current assets	21,034			27,422
Property and equipment, net	227,845			232,941
Investment in subsidiaries	390,061			380,166
Goodwill and other intangible assets, net	454,443			459,348
Other assets	(1,654)			(4,797)
Total assets	4,722,651			4,490,106
Liabilities and Stockholders’ (Deficit) Equity
Accounts payable	219,508			233,936
Accrued liabilities	105,554			125,179
Long-term debt	2			1
Other liabilities	15,096			15,250
Deferred income tax liabilities, net	83,043			71,071
Total liabilities	423,203			445,437
Total stockholders’ (deficit) equity	4,299,448			4,044,669
Total liabilities and stockholders’ (deficit) equity	4,722,651			4,490,106
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	26,591			48,235	$ 49,459			$ 41,659
Trade and other accounts receivable, net	36,993			37,191
Inventory	246,681			230,338
Other current assets	13,976			13,417
Property and equipment, net	64,520			75,408
Goodwill and other intangible assets, net	144,962			149,275
Other assets	18,118			18,581
Total assets	551,841			572,445
Liabilities and Stockholders’ (Deficit) Equity
Accounts payable	53,101			69,267
Due to affiliates	68,132			81,129
Accrued liabilities	31,438			31,855
Income taxes payable	(402)			40
Long-term debt	864			882
Other liabilities	3,884			4,210
Deferred income tax liabilities, net	4,763			4,896
Total liabilities	161,780			192,279
Total stockholders’ (deficit) equity	390,061			380,166
Total liabilities and stockholders’ (deficit) equity	551,841			572,445
Consolidating Eliminations
Assets
Due from affiliates	(2,818,602)			(2,598,681)
Investment in subsidiaries	(6,253,298)			(5,793,762)
Total assets	(9,071,900)			(8,392,443)
Liabilities and Stockholders’ (Deficit) Equity
Due to affiliates	(2,818,602)			(2,598,681)
Total liabilities	(2,818,602)			(2,598,681)
Total stockholders’ (deficit) equity	(6,253,298)			(5,793,762)
Total liabilities and stockholders’ (deficit) equity	$ (9,071,900)			$ (8,392,443)