Organization, Basis of Presentation and Significant Accounting Policies	3 Months Ended
Nov. 30, 2017
Accounting Policies [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies	Organization, Basis of Presentation and Significant Accounting Policies Basis of Presentation The unaudited Consolidated Balance Sheet as of November 30, 2017, the Consolidated Statements of Operations for the three months ended November 30, 2017, and 2016, the Consolidated Statements of Comprehensive Income for the three months ended November 30, 2017, and 2016, and the Consolidated Statements of Cash Flows for the three months ended November 30, 2017, and 2016, reflect in the opinion of our management, all normal recurring adjustments necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for interim periods are not necessarily indicative of results for a full fiscal year because of, among other things, the seasonal nature of our businesses. Our Consolidated Balance Sheet data as of August 31, 2017, has been derived from our audited consolidated financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("U.S. GAAP"). Over the course of fiscal year 2017, we incurred charges relating to a trading partner of ours in Brazil, which entered into bankruptcy-like proceedings under Brazilian law, intangible and fixed asset impairment charges associated with certain assets meeting the criteria to be classified as held for sale, fixed asset impairment charges due to the cancellation of a capital project at one of our refineries and bad debt and loan loss reserve charges relating to a single large producer borrower. Charges and impairments of this nature, as well as any recoveries related to amounts previously reserved, are included in the Consolidated Statements of Operations in the line item, "Reserve and impairment charges (recoveries), net" for the three months ended November 30, 2017, and 2016. The timing and amounts of these charges and impairments, and any recoveries were determined utilizing facts and circumstances that were present in the respective quarters in which the charge, impairments or recoveries were recorded. Prior year information has been revised to conform to the current year presentation. The notes to our consolidated financial statements reference our Energy, Ag, Nitrogen Production and Foods reportable segments, as well as our Corporate and Other category, which represents an aggregation of individually immaterial operating segments. The Nitrogen Production reportable segment resulted from our investment in CF Industries Nitrogen, LLC ("CF Nitrogen") in February 2016. The Foods segment resulted from our investment in Ventura Foods, LLC ("Ventura Foods") becoming a significant operating segment in fiscal 2016. See Note 9, Segment Reporting for more information. Our consolidated financial statements include the accounts of CHS and all of our wholly owned and majority owned subsidiaries. The effects of all significant intercompany transactions have been eliminated. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended August 31, 2017, included in our Annual Report on Form 10-K, filed with the Securities and Exchange Commission (the "SEC"). Recent Accounting Pronouncements Adopted In October 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory (Topic 740). This ASU is intended to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory by requiring an entity to recognize the income tax consequences when a transfer occurs, instead of when an asset is sold to an outside party. This ASU is effective for periods beginning after December 15, 2017; however, early adoption of this ASU is permitted during the first interim period if an entity issues interim financial statements and the amendments in this ASU should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We elected to early adopt ASU No. 2016-16 during the first quarter of fiscal 2018. The adoption did not have a material impact on our consolidated financial statements. Not Yet Adopted In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU is intended to improve the financial reporting of hedging relationships to better represent the economic results of an entity’s risk management activities in its financial statements and make certain improvements to simplify the application of the hedge accounting guidance. The amendments in this ASU will make more financial and nonfinancial hedging strategies eligible for hedge accounting, amend the presentation and disclosure requirements and change how entities assess effectiveness. Entities are required to apply this ASU's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This ASU is effective for us beginning September 1, 2019, for our fiscal year 2020 and for interim periods within that fiscal year. We are currently evaluating the impact the adoption will have on our consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Costs and Net Postretirement Benefit Cost. This ASU changes the presentation of net periodic pension cost and net periodic postretirement benefit cost in the income statement. This ASU requires that the service cost component should be included in the same income statement line item as other compensation costs arising from services rendered by the employees during the period. The other components of net periodic benefit cost should be presented in the income statement separately outside of operating income if that subtotal is presented. Additionally, only service cost may be capitalized in assets. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. The guidance on the presentation of the components of net periodic benefit cost in the income statement should be applied retrospectively and the guidance regarding the capitalization of the service cost component in assets should be applied prospectively. The adoption of this amended guidance is not expected to have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The amendments within this ASU narrow the existing definition of a business and provide a more robust framework for evaluating whether a transaction should be accounted for as an acquisition (or disposal) of assets or a business. The definition of a business impacts various areas of accounting, including acquisitions, disposals and goodwill. Under the new guidance, fewer acquisitions are expected to be considered businesses. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. Early adoption is permitted and the guidance should be applied prospectively to transactions following the adoption date. The adoption of this amended guidance is not expected to have a material impact on our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. This ASU is intended to reduce diversity in practice by adding or clarifying guidance on classification and presentation of changes in restricted cash on the statement of cash flows. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. Early adoption is permitted, including in an interim period. The amendments in this ASU should be applied retrospectively to all periods presented. The adoption of this amended guidance is not expected to have a material impact on our consolidated statement of cash flows. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This ASU is intended to reduce existing diversity in practice in how certain cash receipts and payments are presented and classified in the statement of cash flows. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. The adoption of this amended guidance is not expected to have a material impact on our consolidated statement of cash flows. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in this ASU introduce a new approach, based on expected losses, to estimate credit losses on certain types of financial instruments. This ASU is intended to provide financial statement users with more decision-useful information about the expected credit losses associated with most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt securities, net investments in leases, and off-balance-sheet credit exposures. Entities are required to apply this ASU’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This ASU is effective for us beginning September 1, 2020, for our fiscal year 2021 and for interim periods within that fiscal year. We are currently evaluating the impact the adoption will have on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which replaces the existing guidance in Accounting Standards Codification ("ASC") 840 - Leases. The amendments within this ASU introduce a lessee model requiring entities to recognize assets and liabilities for most leases, but continue recognizing the associated expenses in a manner similar to existing accounting guidance. This ASU does not make fundamental changes to existing lessor accounting; however, it does modify what constitutes a sales-type or direct financing lease and the related accounting, and aligns a number of the underlying principles with those of the new revenue standard, ASU No. 2014-09. The guidance also eliminates existing real estate-specific provisions and requires expanded qualitative and quantitative disclosures. This ASU is effective for us beginning September 1, 2019, for our fiscal year 2020 and for interim periods within that fiscal year, and the ASU’s provisions are required to be applied using a modified retrospective approach. We have initiated a preliminary assessment of the new lease standard, including the implementation of a new lease software that will improve the collection, maintenance, and aggregation of lease data necessary for the reporting and disclosure requirements under the new lease standard. One of the more significant changes arising from the new lease standard relates to a number of operating lease agreements not currently recognized on our Consolidated Balance Sheets. The new lease guidance will require these lease agreements to be recognized on the Consolidated Balance Sheets as a right-of-use asset along with a corresponding lease liability. As a result, our preliminary assessment indicates the provisions of ASU No. 2016-02 are expected to have a material impact on our Consolidated Balance Sheets. Although we expect the new lease guidance to have a material impact on our Consolidated Balance Sheets, we are continuing to evaluate the extent of potential impact the new lease guidance will have on our consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The amendments within this ASU, as well as within additional clarifying ASUs issued by the FASB, provide a single comprehensive model to be used in the accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The new revenue recognition guidance includes a five-step model for the recognition of revenue, including (1) identifying the contract with a customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations, and (5) recognizing revenue when (or as) an entity satisfies a performance obligation. The new revenue recognition guidance also specifies the accounting for certain costs to obtain or fulfill a contract with a customer and requires expanded disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We have completed an initial assessment of our revenue streams and do not believe that the new revenue recognition guidance will have a material impact on our consolidated financial statements. Certain revenue streams are expected to fall within the scope of the new revenue recognition guidance; however, a substantial portion of our revenue falls outside the scope of the new revenue recognition guidance and will continue to follow existing guidance, primarily ASC 815, Derivatives and Hedging. We are continuing to evaluate the impact of the new revenue recognition guidance, including potential changes to business practices and/or contractual terms for in scope revenue streams, as well as the scope of expanded disclosures related to revenue. We expect to complete our final evaluation and implementation of the new revenue recognition guidance throughout fiscal 2018, which will allow us to adopt ASU No. 2014-09 and the related ASUs on September 1, 2018, in the first quarter of fiscal 2019, using the modified retrospective method.

Organization, Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The unaudited Consolidated Balance Sheet as of November 30, 2017, the Consolidated Statements of Operations for the three months ended November 30, 2017, and 2016, the Consolidated Statements of Comprehensive Income for the three months ended November 30, 2017, and 2016, and the Consolidated Statements of Cash Flows for the three months ended November 30, 2017, and 2016, reflect in the opinion of our management, all normal recurring adjustments necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for interim periods are not necessarily indicative of results for a full fiscal year because of, among other things, the seasonal nature of our businesses. Our Consolidated Balance Sheet data as of August 31, 2017, has been derived from our audited consolidated financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("U.S. GAAP").

Over the course of fiscal year 2017, we incurred charges relating to a trading partner of ours in Brazil, which entered into bankruptcy-like proceedings under Brazilian law, intangible and fixed asset impairment charges associated with certain assets meeting the criteria to be classified as held for sale, fixed asset impairment charges due to the cancellation of a capital project at one of our refineries and bad debt and loan loss reserve charges relating to a single large producer borrower. Charges and impairments of this nature, as well as any recoveries related to amounts previously reserved, are included in the Consolidated Statements of Operations in the line item, "Reserve and impairment charges (recoveries), net" for the three months ended November 30, 2017, and 2016. The timing and amounts of these charges and impairments, and any recoveries were determined utilizing facts and circumstances that were present in the respective quarters in which the charge, impairments or recoveries were recorded. Prior year information has been revised to conform to the current year presentation.

The notes to our consolidated financial statements reference our Energy, Ag, Nitrogen Production and Foods reportable segments, as well as our Corporate and Other category, which represents an aggregation of individually immaterial operating segments. The Nitrogen Production reportable segment resulted from our investment in CF Industries Nitrogen, LLC ("CF Nitrogen") in February 2016. The Foods segment resulted from our investment in Ventura Foods, LLC ("Ventura Foods") becoming a significant operating segment in fiscal 2016. See Note 9, Segment Reporting for more information.

Our consolidated financial statements include the accounts of CHS and all of our wholly owned and majority owned subsidiaries. The effects of all significant intercompany transactions have been eliminated.

These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended August 31, 2017, included in our Annual Report on Form 10-K, filed with the Securities and Exchange Commission (the "SEC").

Recent Accounting Pronouncements

Adopted

In October 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes - Intra-Entity Transfers of Assets Other Than Inventory (Topic 740). This ASU is intended to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory by requiring an entity to recognize the income tax consequences when a transfer occurs, instead of when an asset is sold to an outside party. This ASU is effective for periods beginning after December 15, 2017; however, early adoption of this ASU is permitted during the first interim period if an entity issues interim financial statements and the amendments in this ASU should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We elected to early adopt ASU No. 2016-16 during the first quarter of fiscal 2018. The adoption did not have a material impact on our consolidated financial statements.

Not Yet Adopted

In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU is intended to improve the financial reporting of hedging relationships to better represent the economic results of an entity’s risk management activities in its financial statements and make certain improvements to simplify the application of the hedge accounting guidance. The amendments in this ASU will make more financial and nonfinancial hedging strategies eligible for hedge accounting, amend the presentation and disclosure requirements and change how entities assess effectiveness. Entities are required to apply this ASU's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This ASU is effective for us beginning September 1, 2019, for our fiscal year 2020 and for interim periods within that fiscal year. We are currently evaluating the impact the adoption will have on our consolidated financial statements.

In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Costs and Net Postretirement Benefit Cost. This ASU changes the presentation of net periodic pension cost and net periodic postretirement benefit cost in the income statement. This ASU requires that the service cost component should be included in the same income statement line item as other compensation costs arising from services rendered by the employees during the period. The other components of net periodic benefit cost should be presented in the income statement separately outside of operating income if that subtotal is presented. Additionally, only service cost may be capitalized in assets. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. The guidance on the presentation of the components of net periodic benefit cost in the income statement should be applied retrospectively and the guidance regarding the capitalization of the service cost component in assets should be applied prospectively. The adoption of this amended guidance is not expected to have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The amendments within this ASU narrow the existing definition of a business and provide a more robust framework for evaluating whether a transaction should be accounted for as an acquisition (or disposal) of assets or a business. The definition of a business impacts various areas of accounting, including acquisitions, disposals and goodwill. Under the new guidance, fewer acquisitions are expected to be considered businesses. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. Early adoption is permitted and the guidance should be applied prospectively to transactions following the adoption date. The adoption of this amended guidance is not expected to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. This ASU is intended to reduce diversity in practice by adding or clarifying guidance on classification and presentation of changes in restricted cash on the statement of cash flows. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. Early adoption is permitted, including in an interim period. The amendments in this ASU should be applied retrospectively to all periods presented. The adoption of this amended guidance is not expected to have a material impact on our consolidated statement of cash flows.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This ASU is intended to reduce existing diversity in practice in how certain cash receipts and payments are presented and classified in the statement of cash flows. This ASU is effective for us beginning September 1, 2018, for our fiscal year 2019 and for interim periods within that fiscal year. The adoption of this amended guidance is not expected to have a material impact on our consolidated statement of cash flows.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in this ASU introduce a new approach, based on expected losses, to estimate credit losses on certain types of financial instruments. This ASU is intended to provide financial statement users with more decision-useful information about the expected credit losses associated with most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt securities, net investments in leases, and off-balance-sheet credit exposures. Entities are required to apply this ASU’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. This ASU is effective for us beginning September 1, 2020, for our fiscal year 2021 and for interim periods within that fiscal year. We are currently evaluating the impact the adoption will have on our consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which replaces the existing guidance in Accounting Standards Codification ("ASC") 840 - Leases. The amendments within this ASU introduce a lessee model requiring entities to recognize assets and liabilities for most leases, but continue recognizing the associated expenses in a manner similar to existing accounting guidance. This ASU does not make fundamental changes to existing lessor accounting; however, it does modify what constitutes a sales-type or direct financing lease and the related accounting, and aligns a number of the underlying principles with those of the new revenue standard, ASU No. 2014-09. The guidance also eliminates existing real estate-specific provisions and requires expanded qualitative and quantitative disclosures. This ASU is effective for us beginning September 1, 2019, for our fiscal year 2020 and for interim periods within that fiscal year, and the ASU’s provisions are required to be applied using a modified retrospective approach. We have initiated a preliminary assessment of the new lease standard, including the implementation of a new lease software that will improve the collection, maintenance, and aggregation of lease data necessary for the reporting and disclosure requirements under the new lease standard. One of the more significant changes arising from the new lease standard relates to a number of operating lease agreements not currently recognized on our Consolidated Balance Sheets. The new lease guidance will require these lease agreements to be recognized on the Consolidated Balance Sheets as a right-of-use asset along with a corresponding lease liability. As a result, our preliminary assessment indicates the provisions of ASU No. 2016-02 are expected to have a material impact on our Consolidated Balance Sheets. Although we expect the new lease guidance to have a material impact on our Consolidated Balance Sheets, we are continuing to evaluate the extent of potential impact the new lease guidance will have on our consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The amendments within this ASU, as well as within additional clarifying ASUs issued by the FASB, provide a single comprehensive model to be used in the accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The new revenue recognition guidance includes a five-step model for the recognition of revenue, including (1) identifying the contract with a customer, (2) identifying the performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the performance obligations, and (5) recognizing revenue when (or as) an entity satisfies a performance obligation. The new revenue recognition guidance also specifies the accounting for certain costs to obtain or fulfill a contract with a customer and requires expanded disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We have completed an initial assessment of our revenue streams and do not believe that the new revenue recognition guidance will have a material impact on our consolidated financial statements. Certain revenue streams are expected to fall within the scope of the new revenue recognition guidance; however, a substantial portion of our revenue falls outside the scope of the new revenue recognition guidance and will continue to follow existing guidance, primarily ASC 815, Derivatives and Hedging. We are continuing to evaluate the impact of the new revenue recognition guidance, including potential changes to business practices and/or contractual terms for in scope revenue streams, as well as the scope of expanded disclosures related to revenue. We expect to complete our final evaluation and implementation of the new revenue recognition guidance throughout fiscal 2018, which will allow us to adopt ASU No. 2014-09 and the related ASUs on September 1, 2018, in the first quarter of fiscal 2019, using the modified retrospective method.