Basis Of Presentation (Policy)	6 Months Ended
Feb. 28, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles Of Consolidation	Principles of Consolidation The accompanying financial statements include the accounts of the Company, its wholly owned subsidiaries and a number of Company Drive-Ins in which a subsidiary has a controlling ownership interest. All intercompany accounts and transactions have been eliminated.
Reclassifications	Reclassifications Certain amounts reported in previous years, which are not material, have been combined and reclassified to conform to the current-year presentation.
New Accounting Pronouncements	Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers,” which requires an entity to recognize revenue in an amount that reflects the consideration to which the entity expects to be entitled for the transfer of promised goods or services to customers. The standard also requires additional disclosure regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The ASU will replace most of the existing revenue recognition requirements in U.S. GAAP when it becomes effective. Further, in March 2016, the FASB issued ASU No. 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” which clarifies the guidance in ASU No. 2014-09 for evaluating when another party, along with the entity, is involved in providing a good or service to a customer. In April 2016, the FASB issued ASU No. 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” which clarifies the guidance in ASU No. 2014-09 regarding assessing whether promises to transfer goods or services are distinct, and whether an entity's promise to grant a license provides a customer with a right to use or right to access the entity's intellectual property. In December 2016, the FASB issued ASU No. 2016-20, "Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers," which provides corrections or improvements to issues that affect narrow aspects of the guidance issued in ASU No. 2014-09. The Company plans to adopt the standard in the first quarter of fiscal year 2019, which aligns with the required adoption date. The standards are to be applied retrospectively or using a cumulative effect transition method, with early application not permitted. The Company does not believe the new revenue recognition standard will impact the recognition of sales from Company Drive-Ins or the recognition of royalty fees from franchisees. The Company expects the pronouncement will impact the recognition of the initial franchise fee, which is currently recognized upon the opening of a Franchise Drive-In. The impact on these fees has not yet been estimated, and no transition method has been selected. The Company is currently evaluating the effect that this pronouncement will have on the recognition of other transactions, the financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, “Leases.” The new standard, which replaces existing lease guidance, requires lessees to recognize on the balance sheet a liability to make lease payments and a corresponding right-of-use asset. The guidance also requires certain qualitative and quantitative disclosures designed to assess the amount, timing and uncertainty of cash flows arising from leases. Accounting guidance for lessors is largely unchanged. The standard is effective for fiscal year 2020, with early application permitted. This standard requires adoption based upon a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with optional practical expedients. Based on a preliminary assessment, the Company expects that most of its operating lease commitments will be subject to the new guidance and recognized as operating lease liabilities and right-of-use assets upon adoption, resulting in a significant increase in the assets and liabilities on the consolidated balance sheet. The Company is continuing its assessment, which may identify additional impacts this standard will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-04, “Liabilities – Extinguishment of Liabilities: Recognition of Breakage for Certain Prepaid Stored-Value Products,” which is intended to eliminate current and future diversity in practice related to derecognition of prepaid stored-value product liability in a way that aligns with the new revenue recognition guidance. The update is effective for fiscal year 2019; however, early adoption is permitted. The adoption of the update is not expected to have a material impact on the Company’s financial statements. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses.” The update was issued to provide more decision-useful information about the expected credit losses on financial instruments. The update replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The update is effective for fiscal year 2021, with early adoption permitted for fiscal years beginning after December 15, 2018. The update should be adopted using a modified-retrospective approach. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments.” The update is intended to reduce diversity in practice in how certain transactions are classified and will make eight targeted changes to how cash receipts and cash payments are presented in the statement of cash flows. The update is effective for fiscal year 2019. The new standard will require adoption on a retrospective basis unless it is impracticable to apply, in which case the amendments will apply prospectively as of the earliest date practicable. The Company is currently evaluating the effect of this update but does not believe it will have a material impact on its financial statements and related disclosures. In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory" as part of its simplification initiatives. The update requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than deferring the recognition until the asset has been sold to an outside party as is required under current GAAP. The update is effective for fiscal year 2019. The new standard will require adoption on a modified retrospective basis through a cumulative-effect adjustment to retained earnings, and early adoption is permitted. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures. In November 2016, the FASB issued ASU No. 2016-18, "Statement of Cash Flows - Restricted Cash." The update requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The update is effective for fiscal year 2019. The amendments should be adopted on a retrospective basis to each period presented, and early adoption is permitted. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-04, "Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment." To simplify the subsequent measurement of goodwill, the update requires only a single-step quantitative test to identify and measure impairment based on the excess of a reporting unit's carrying amount over its fair value. A qualitative assessment may still be completed first for an entity to determine if a quantitative impairment test is necessary. The update is effective for fiscal year 2021 and is to be adopted on a prospective basis. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company plans to adopt this standard in fiscal year 2017. The adoption of this standard will have no impact on the Company's consolidated financial statements. The Company has reviewed all other recently issued accounting pronouncements and concluded they are not applicable or not expected to be significant to our operations. Recently Adopted Accounting Pronouncements In April 2015, the FASB issued ASU No. 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” This update requires debt issuance costs to be presented in the balance sheet as a reduction of the related liability rather than as an asset. The recognition and measurement guidance for debt issuance costs are not affected by this update. This update is effective for fiscal years beginning after December 15, 2015, including interim periods within that reporting period, and is to be applied retrospectively; early adoption is permitted. In August 2015, the FASB issued ASU 2015-15, which addresses the SEC’s comments related to the absence of authoritative guidance within ASU 2015-03 related to line-of-credit arrangements. The SEC would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company retrospectively adopted this guidance in the first quarter of fiscal year 2017, which resulted in a reclassification of unamortized debt issuance costs of $11.3 million related to the Company's fixed rate notes from non-current assets to long-term debt, net, within the Company's consolidated balance sheet, resulting in a corresponding reduction in total assets and total long-term liabilities as of August 31, 2016. Other than this reclassification, the adoption of this ASU did not have any other impact on the Company's consolidated financial statements. As of February 28, 2017, there was $10.4 million of unamortized debt issuance costs related to the Company's fixed rate notes included within long-term debt, net on the Company's condensed consolidated balance sheet. In April 2015, the FASB issued ASU No. 2015-05, “Customer's Accounting for Fees Paid in a Cloud Computing Arrangement.” The update provides clarification on whether a cloud computing arrangement includes a software license. If a software license is included, the customer should account for the license consistent with its accounting of other software licenses. If a software license is not included, the arrangement should be accounted for as a service contract. The update is effective for fiscal years beginning after December 15, 2015. The Company adopted this standard in the first quarter of fiscal year 2017 on a prospective basis. The adoption did not have a material impact on the Company’s consolidated financial statements. During the first quarter of fiscal 2017, the Company early adopted ASU No. 2016-09, “Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting,” which simplifies several aspects of accounting for share-based payment transactions, including excess tax benefits, an accounting policy election for forfeitures, statutory tax withholding requirements and classification in the statements of cash flows. As required by the update, on a prospective basis, the Company recognized excess tax benefits related to share-based payments in the provision for income taxes in the condensed consolidated statements of income. These items were historically recorded in additional paid-in capital. As allowed by the update, on a prospective basis, cash flows related to excess tax benefits recognized on stock-based compensation expense are classified as an operating activity in the Company's condensed consolidated statements of cash flows. These prospective changes did not have a material impact on the Company's financial statements for the first half of fiscal year 2017. Cash paid on employees’ behalf related to shares withheld for tax purposes continues to be classified as a financing activity. The stock compensation expense continues to reflect estimated forfeitures.

Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers,” which requires an entity to recognize revenue in an amount that reflects the consideration to which the entity expects to be entitled for the transfer of promised goods or services to customers. The standard also requires additional disclosure regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The ASU will replace most of the existing revenue recognition requirements in U.S. GAAP when it becomes effective. Further, in March 2016, the FASB issued ASU No. 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net),” which clarifies the guidance in ASU No. 2014-09 for evaluating when another party, along with the entity, is involved in providing a good or service to a customer. In April 2016, the FASB issued ASU No. 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” which clarifies the guidance in ASU No. 2014-09 regarding assessing whether promises to transfer goods or services are distinct, and whether an entity's promise to grant a license provides a customer with a right to use or right to access the entity's intellectual property. In December 2016, the FASB issued ASU No. 2016-20, "Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers," which provides corrections or improvements to issues that affect narrow aspects of the guidance issued in ASU No. 2014-09.

The Company plans to adopt the standard in the first quarter of fiscal year 2019, which aligns with the required adoption date. The standards are to be applied retrospectively or using a cumulative effect transition method, with early application not permitted. The Company does not believe the new revenue recognition standard will impact the recognition of sales from Company Drive-Ins or the recognition of royalty fees from franchisees. The Company expects the pronouncement will impact the recognition of the initial franchise fee, which is currently recognized upon the opening of a Franchise Drive-In. The impact on these fees has not yet been estimated, and no transition method has been selected. The Company is currently evaluating the effect that this pronouncement will have on the recognition of other transactions, the financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, “Leases.” The new standard, which replaces existing lease guidance, requires lessees to recognize on the balance sheet a liability to make lease payments and a corresponding right-of-use asset. The guidance also requires certain qualitative and quantitative disclosures designed to assess the amount, timing and uncertainty of cash flows arising from leases. Accounting guidance for lessors is largely unchanged. The standard is effective for fiscal year 2020, with early application permitted. This standard requires adoption based upon a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with optional practical expedients. Based on a preliminary assessment, the Company expects that most of its operating lease commitments will be subject to the new guidance and recognized as operating lease liabilities and right-of-use assets upon adoption, resulting in a significant increase in the assets and liabilities on the consolidated balance sheet. The Company is continuing its assessment, which may identify additional impacts this standard will have on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU No. 2016-04, “Liabilities – Extinguishment of Liabilities: Recognition of Breakage for Certain Prepaid Stored-Value Products,” which is intended to eliminate current and future diversity in practice related to derecognition of prepaid stored-value product liability in a way that aligns with the new revenue recognition guidance. The update is effective for fiscal year 2019; however, early adoption is permitted. The adoption of the update is not expected to have a material impact on the Company’s financial statements.

In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses.” The update was issued to provide more decision-useful information about the expected credit losses on financial instruments. The update replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The update is effective for fiscal year 2021, with early adoption permitted for fiscal years beginning after December 15, 2018. The update should be adopted using a modified-retrospective approach. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows – Classification of Certain Cash Receipts and Cash Payments.” The update is intended to reduce diversity in practice in how certain transactions are classified and will make eight targeted changes to how cash receipts and cash payments are presented in the statement of cash flows. The update is effective for fiscal year 2019. The new standard will require adoption on a retrospective basis unless it is impracticable to apply, in which case the amendments will apply prospectively as of the earliest date practicable. The Company is currently evaluating the effect of this update but does not believe it will have a material impact on its financial statements and related disclosures.

In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory" as part of its simplification initiatives. The update requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than deferring the recognition until the asset has been sold to an outside party as is required under current GAAP. The update is effective for fiscal year 2019. The new standard will require adoption on a modified retrospective basis through a cumulative-effect adjustment to retained earnings, and early adoption is permitted. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures.

In November 2016, the FASB issued ASU No. 2016-18, "Statement of Cash Flows - Restricted Cash." The update requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The update is effective for fiscal year 2019. The amendments should be adopted on a retrospective basis to each period presented, and early adoption is permitted. The Company is currently evaluating the effect that this update will have on its financial statements and related disclosures.

In January 2017, the FASB issued ASU No. 2017-04, "Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment." To simplify the subsequent measurement of goodwill, the update requires only a single-step quantitative test to identify and measure impairment based on the excess of a reporting unit's carrying amount over its fair value. A qualitative assessment may still be completed first for an entity to determine if a quantitative impairment test is necessary. The update is effective for fiscal year 2021 and is to be adopted on a prospective basis. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company plans to adopt this standard in fiscal year 2017. The adoption of this standard will have no impact on the Company's consolidated financial statements.

The Company has reviewed all other recently issued accounting pronouncements and concluded they are not applicable or not expected to be significant to our operations.

Recently Adopted Accounting Pronouncements

In April 2015, the FASB issued ASU No. 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” This update requires debt issuance costs to be presented in the balance sheet as a reduction of the related liability rather than as an asset. The recognition and measurement guidance for debt issuance costs are not affected by this update. This update is effective for fiscal years beginning after December 15, 2015, including interim periods within that reporting period, and is to be applied retrospectively; early adoption is permitted. In August 2015, the FASB issued ASU 2015-15, which addresses the SEC’s comments related to the absence of authoritative guidance within ASU 2015-03 related to line-of-credit arrangements. The SEC would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company retrospectively adopted this guidance in the first quarter of fiscal year 2017, which resulted in a reclassification of unamortized debt issuance costs of $11.3 million related to the Company's fixed rate notes from non-current assets to long-term debt, net, within the Company's consolidated balance sheet, resulting in a corresponding reduction in total assets and total long-term liabilities as of August 31, 2016. Other than this reclassification, the adoption of this ASU did not have any other impact on the Company's consolidated financial statements. As of February 28, 2017, there was $10.4 million of unamortized debt issuance costs related to the Company's fixed rate notes included within long-term debt, net on the Company's condensed consolidated balance sheet.

In April 2015, the FASB issued ASU No. 2015-05, “Customer's Accounting for Fees Paid in a Cloud Computing Arrangement.” The update provides clarification on whether a cloud computing arrangement includes a software license. If a software license is included, the customer should account for the license consistent with its accounting of other software licenses. If a software license is not included, the arrangement should be accounted for as a service contract. The update is effective for fiscal years beginning after December 15, 2015. The Company adopted this standard in the first quarter of fiscal year 2017 on a prospective basis. The adoption did not have a material impact on the Company’s consolidated financial statements.

During the first quarter of fiscal 2017, the Company early adopted ASU No. 2016-09, “Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting,” which simplifies several aspects of accounting for share-based payment transactions, including excess tax benefits, an accounting policy election for forfeitures, statutory tax withholding requirements and classification in the statements of cash flows. As required by the update, on a prospective basis, the Company recognized excess tax benefits related to share-based payments in the provision for income taxes in the condensed consolidated statements of income. These items were historically recorded in additional paid-in capital. As allowed by the update, on a prospective basis, cash flows related to excess tax benefits recognized on stock-based compensation expense are classified as an operating activity in the Company's condensed consolidated statements of cash flows. These prospective changes did not have a material impact on the Company's financial statements for the first half of fiscal year 2017. Cash paid on employees’ behalf related to shares withheld for tax purposes continues to be classified as a financing activity. The stock compensation expense continues to reflect estimated forfeitures.