Significant Accounting Policies and Recent Accounting Pronouncements (Details)	2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jun. 08, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 08, 2016 USD ($)	Jun. 30, 2016 USD ($) supplier	Jun. 30, 2015 USD ($) supplier	Sep. 30, 2015 USD ($)
Accounting Policies [Line Items]
Concentration risk, number of suppliers | supplier					2	1
Threshold period past due for review of collectability					90 days
Goodwill impairment					$ 0
Minimum | Certain Nexeo Plaschem Customers
Accounting Policies [Line Items]
Threshold period for customers to remit payment					30 days
Maximum | Certain Nexeo Plaschem Customers
Accounting Policies [Line Items]
Threshold period for customers to remit payment					9 months
Successor
Accounting Policies [Line Items]
Concentration risk, percentage					10.00%
Accounts and notes receivable, net		$ 475,900,000			$ 475,900,000
Allowance for doubtful accounts		100,000			100,000
Debt expense		100,000			100,000
Goodwill		693,400,000			693,400,000		$ 0
Finite-lived intangible assets		216,200,000			216,200,000
Goodwill impairment		0
Net foreign currency transaction losses		(400,000)
Customer rebates					600,000
Customer rebates payable		3,600,000			3,600,000
Suppliers rebates					500,000
Advertising expense		0			0
Research and development expense		0			0
Successor | Certain Nexeo Plaschem Customers
Accounting Policies [Line Items]
Accounts and notes receivable, net		7,000,000			$ 7,000,000
Successor | Plants and buildings | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					5 years
Successor | Plants and buildings | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					35 years
Successor | Machinery and equipment | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					2 years
Successor | Machinery and equipment | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					30 years
Successor | Software and computer equipment | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					3 years
Successor | Software and computer equipment | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					10 years
Predecessor
Accounting Policies [Line Items]
Concentration risk, percentage					13.00%	13.00%
Accounts and notes receivable, net							508,700,000
Allowance for doubtful accounts							3,800,000
Debt expense	$ 100,000		$ 400,000	$ 1,200,000		$ 300,000
Goodwill							373,700,000
Finite-lived intangible assets							111,400,000
Goodwill impairment	0		0	0		0
Net foreign currency transaction losses	(1,300,000)		(300,000)	(1,600,000)		(900,000)
Customer rebates	1,100,000		1,100,000	4,000,000		3,900,000
Customer rebates payable							4,000,000
Suppliers rebates	1,800,000	3,400,000		6,500,000	$ 11,200,000
Supplier rebates due to company		$ 2,400,000			$ 2,400,000		3,400,000
Advertising expense	500,000		400,000	1,300,000		1,700,000
Research and development expense	$ 0		$ 0	$ 0		$ 0
Predecessor | Certain Nexeo Plaschem Customers
Accounting Policies [Line Items]
Accounts and notes receivable, net							$ 4,500,000
Predecessor | Plants and buildings | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					5 years
Predecessor | Plants and buildings | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					35 years
Predecessor | Machinery and equipment | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					2 years
Predecessor | Machinery and equipment | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					30 years
Predecessor | Software and computer equipment | Minimum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					3 years
Predecessor | Software and computer equipment | Maximum
Accounting Policies [Line Items]
Property, plant and equipment, useful life (years)					10 years