Minimum valuation funded percentage.

No definition available.

Name:	schn_MinimumValuationFundedPercentage
Namespace Prefix:	schn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of multiemployer plans.

+ References

No definition available.

+ Details

Name:	schn_MultiemployerPlanNumberOfPlans
Namespace Prefix:	schn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Multiemployer plan rehabilitation plan contributions as percent of contributions.

+ References

No definition available.

+ Details

Name:	schn_MultiemployerPlanRehabilitationPlanContributionsAsPercentOfContributions
Namespace Prefix:	schn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 35
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

+ Details

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

- Definition

Expiration date of collective-bargaining arrangement (CBA) requiring contribution to multiemployer pension plan determined to be individually significant, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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_MultiemployerPlansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=schn_SteelworkersWesternIndependentShopsPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Employee Benefits - Multiemployer Pension Plans - Additional Information (Details) $ in Millions	12 Months Ended
	Aug. 31, 2022 USD ($) Plan	Aug. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Oct. 01, 2029
Multiemployer Plans [Line Items]
Number of multiemployer plans \| Plan	14
Multiemployer Plans, Pension
Multiemployer Plans [Line Items]
Multiemployer plan, contributions by employer	$ 7	$ 6	$ 6
Steelworkers Western Independent Shops Pension Plan
Multiemployer Plans [Line Items]
Multiemployer plan, expiration date	Mar. 31, 2026
Multiemployer plan, contributions by employer	$ 4	$ 4	$ 3
Steelworkers Western Independent Shops Pension Plan \| Scenario, Forecast
Multiemployer Plans [Line Items]
Minimum valuation funded percentage				100.00%
Steelworkers Western Independent Shops Pension Plan \| Minimum
Multiemployer Plans [Line Items]
Multiemployer plan rehabilitation plan contributions as a percent of total contributions	5.00%