Effective Period of Plan

No definition available.

Name:	nexeo_EffectivePeriodOfPlan
Namespace Prefix:	nexeo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Restricted Shares Awarded to Employee by Related Party

+ References

No definition available.

+ Details

Name:	nexeo_RestrictedSharesAwardedToEmployeeByRelatedParty
Namespace Prefix:	nexeo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term

+ References

No definition available.

+ Details

Name:	nexeo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm
Namespace Prefix:	nexeo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Number of Common Shares Entitled to Receive

+ References

No definition available.

+ Details

Name:	nexeo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfNumberOfCommonSharesEntitledToReceive
Namespace Prefix:	nexeo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

+ References

No definition available.

+ Details

Name:	nexeo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod
Namespace Prefix:	nexeo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Net number of non-option equity instruments granted to participants.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666

+ Details

Name:	us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) that have been approved for issuance in the equity-based payment transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionSharesApprovedForIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=nexeo_TPGCapitalLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=nexeo_A2016LTIPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=nexeo_PhantomRestrictedStockUnitRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=nexeo_PhantomPerformanceShareUnitPSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share-based Compensation and Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 08, 2016	Nov. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
TPG portfolio entities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares awarded by related party (in shares)									100,000
Forfeited shares (in shares)								11,673
TPG portfolio entities \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period									3 years
2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effective period of plan	10 years
Number of shares available for grant	9,000,000
Shares available for issuance (in shares)						3,967,265
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						193,667
Weighted average remaining contract life						1 year 1 month 6 days
Unrecognized compensation expense related to non-vested performance share units			$ 5.3			$ 5.3
Forfeited shares (in shares)						22,500
Shares vested (in shares)						0
PSUs \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 1.2	$ 1.3		$ 3.5	$ 3.5
PSUs \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						193,667
PSU's granted (in shares)								212,000	1,557,500
Shares authorized for issuance (up to) (in shares)						3,390,334
Expected dividend yield						0.00%
PSUs \| 2016 LTIP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Entitled percentage of common shares to recipient			0.00%			0.00%		0.00%
Expected term (in years)						2 years
Expected stock price volatility						35.00%
Risk-free interest rate						0.90%
PSUs \| 2016 LTIP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Entitled percentage of common shares to recipient			200.00%			200.00%		200.00%
Performance period						3 years		3 years
Expected term (in years)						3 years
Expected stock price volatility						40.00%
Risk-free interest rate						1.30%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						415,867
Weighted average remaining contract life						2 years 1 month 6 days
Unrecognized compensation expense related to non-vested performance share units			$ 2.3			$ 2.3
Forfeited shares (in shares)						24,008
Shares vested (in shares)						0
Shares associated with employee tax withholding for vesting of certain equity awards (in shares)			7,163					9,576
Restricted Stock \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 0.3	0.1		$ 1.0	0.4
Restricted Stock \| TPG portfolio entities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contract life						10 months 24 days
Unrecognized compensation expense related to non-vested performance share units			$ 0.4			$ 0.4
Shares vested (in shares)			27,471					33,297
Restricted Stock \| TPG portfolio entities \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 0.1	0.1		$ 0.2	0.3
Restricted Stock \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		415,867
Restricted Stock \| 2016 LTIP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contract life						9 years 3 months 18 days
Unrecognized compensation expense related to non-vested performance share units			2.1			$ 2.1
Granted (in shares)						999,492
Outstanding options aggregate intrinsic value			$ 1.7			$ 1.7
Exercisable stock options			0			0
Employee Stock Option \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 0.2			$ 0.6
Employee Stock Option \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						999,492
Expected term (in years)						6 years
Expected stock price volatility						35.00%
Expected dividend yield						0.00%
Risk-free interest rate						2.10%
Employee Stock Option \| 2016 LTIP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Phantom RSU \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited shares (in shares)								3,500
Awards issued to certain non-U.S employees (in shares)					10,500
Phantom PSU \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards issued to certain non-U.S employees (in shares)					10,000
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)						0
Weighted average remaining contract life						1 year 4 months 24 days
Unrecognized compensation expense related to non-vested performance share units			0.1			$ 0.1
Forfeited shares (in shares)						0
Shares vested (in shares)						8,162
Shares associated with employee tax withholding for vesting of certain equity awards (in shares)						2,777
RSU \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 0.1	$ 0.1		$ 0.1	$ 0.1
RSU \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					28,000
RSU \| 2016 LTIP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period					3 years