Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Financial Statement Presentation	Financial Statement Presentation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in the consolidated financial statements. On August 1, 2018, the Company completed its merger with CEC, whereby the Company was deemed the acquirer in the business combination for accounting purposes in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Therefore, Strayer Education, Inc. is considered Strategic Education’s predecessor, and its historical financial statements prior to the merger date are reflected in this Quarterly Report on Form 10-Q as the historical financial statements of the Company. Accordingly, the financial results of the Company as of and for any periods ended prior to August 1, 2018 do not include the financial results of CEC and therefore are not directly comparable. All information as of September 30, 2018 and 2019, and for the three and nine months ended September 30, 2018 and 2019 is unaudited but, in the opinion of management, contains all adjustments, consisting only of normal recurring adjustments, necessary to present fairly the condensed consolidated financial position, results of operations, and cash flows of the Company. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements at that date. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the full fiscal year. Certain amounts in the prior period financial statements have been reclassified to conform to the current period's presentation. Effective during the first quarter of 2019, the Company made changes in its presentation of operating expenses and reclassified prior periods to conform to the current presentation. The Company determined that these changes aligned with its organizational structure and will improve comparability with several of its peer companies. There were no changes to total operating expenses or operating income as a result of these reclassifications. Below is a description of the nature of the costs included in the Company’s operating expense categories. Instructional and support costs ("I&SC") generally contain items of expense directly attributable to activities of Strayer University and Capella University (the "Universities") that support students and learners. This expense category includes salaries and benefits of faculty and academic administrators, as well as admissions and administrative personnel who support and serve student interests. Instructional and support costs also include course development costs and costs associated with delivering course content, including educational supplies, facilities, and all other physical plant and occupancy costs, with the exception of costs attributable to the corporate offices. Bad debt expense incurred on delinquent student account balances is also included in instructional and support costs. General and administration ("G&A") expenses include salaries and benefits of management and employees engaged in finance, human resources, legal, regulatory compliance, marketing and other corporate functions. Also included are the costs of advertising and production of marketing materials. General and administration expense also includes the facilities occupancy and other related costs attributable to such functions.
Restricted Cash	Restricted Cash A significant portion of the Company’s revenues are funded by various federal and state government programs. The Company generally does not receive funds from these programs prior to the start of the corresponding academic term. The Company may be required to return certain funds for students who withdraw from the Universities during the academic term. The Company had approximately $5,000 and $2,000 of these unpaid obligations as of December 31, 2018 and September 30, 2019, respectively, which are recorded as restricted cash and included in other current assets in the unaudited condensed consolidated balance sheets. As part of commencing operations in Pennsylvania in 2003, the Company is required to maintain a “minimum protective endowment” of at least $0.5 million in an interest-bearing account as long as the Company operates its campuses in the state. The Company holds these funds in an interest-bearing account which is included in other assets.
Tuition Receivable and Allowance for Doubtful Accounts	Tuition Receivable and Allowance for Doubtful Accounts The Company records tuition receivable and contract liabilities for its students upon the start of the academic term or program. Tuition receivables are not collateralized; however, credit risk is minimized as a result of the diverse nature of the Universities' student bases and through the participation of the majority of the students in federally funded financial aid programs. An allowance for doubtful accounts is established primarily based upon historical collection rates by age of receivable, net of estimated recoveries. These collection rates incorporate historical performance based on a student’s current enrollment status and likelihood of future enrollment. The Company periodically assesses its methodologies for estimating bad debts in consideration of actual experience.
Leases	Leases In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 is intended to improve financial reporting of leasing transactions by requiring organizations that lease assets to recognize assets and liabilities for the rights and obligations created by leases with a term longer than 12 months. ASU 2016-02 also requires additional quantitative and qualitative disclosures surrounding the amount, timing, and uncertainty of cash flows arising from leases. During 2018 and 2019, the FASB issued additional ASUs amending certain aspects of ASU 2016-02. On January 1, 2019, the Company adopted the new accounting standard and all of the related amendments ("ASC 842") using the modified retrospective method. The Company applied ASU 2016-02 to all leases that had commenced as of January 1, 2019. In addition, as permitted by ASU 2016-02, comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company elected the package of practical expedients permitted under ASU 2016-02, which allowed the Company to not reassess prior conclusions regarding lease identification, lease classification, and initial direct costs under the new standard. As a result of adopting the new standard, the Company recognized a lease liability of $123 million and a right-of-use ("ROU") lease asset of $107 million on January 1, 2019. The standard did not materially impact the Company's condensed consolidated statements of income and cash flows. The Company determines if an arrangement is a lease at inception. Leases with an initial term longer than 12 months are included in right-of-use lease assets, lease liabilities, and lease liabilities, non-current on the Company's condensed consolidated balance sheets. The Company combines lease and non-lease components for all leases. ROU lease assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. ROU lease assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. As the implicit interest rate for most of the Company's leases cannot be readily determined, the Company uses its incremental borrowing rate based on information available at the commencement date in determining the present value of lease payments. Lease expense for lease payments is recognized on a straight-line basis over the lease term for operating leases. Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company subleases certain building space to third parties and sublease income is recognized on a straight-line basis over the lease term. See Note 7 for additional information.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill represents the excess of the purchase price of an acquired business over the amount assigned to the assets acquired and liabilities assumed in a business combination. Indefinite-lived intangible assets, which include trade names, are recorded at fair value on their acquisition date. An indefinite life was assigned to the trade names because they have the continued ability to generate cash flows indefinitely. Goodwill and the indefinite-lived intangible assets are assessed at least annually for impairment during the fourth quarter, or more frequently if events occur or circumstances change between annual tests that would more likely than not reduce the fair value of the respective reporting unit or indefinite-lived intangible asset below its carrying amount. Finite-lived intangible assets that are acquired in business combinations are recorded at fair value on their acquisition dates and are amortized on a straight-line basis over the estimated useful life of the asset. Finite-lived intangible assets consist of student relationships. The Company reviews its finite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such assets are not recoverable, a potential impairment loss is recognized to the extent the carrying amount of the assets exceeds the fair value of the assets.
Authorized Stock	Authorized Stock The Company has authorized 32,000,000 shares of common stock, par value $0.01, of which 21,743,498 and 21,964,505 shares were issued and outstanding as of December 31, 2018 and September 30, 2019, respectively. The Company also has authorized 8,000,000 shares of preferred stock, none of which is issued or outstanding. Before any preferred stock may be issued in the future, the Board of Directors would need to establish the preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends, qualifications, and the terms or conditions of the redemption of the preferred stock. In July 2019, the Company’s Board of Directors declared a regular, quarterly cash dividend of $0.50 per share of common stock. The dividend was paid on September 16, 2019.
Net Income Per Share	Net Income (Loss) Per Share Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the periods. Diluted earnings (loss) per share reflects the potential dilution that could occur assuming conversion or exercise of all dilutive unexercised stock options, restricted stock, and restricted stock units. The dilutive effect of stock awards was determined using the treasury stock method. Under the treasury stock method, all of the following are assumed to be used to repurchase shares of the Company’s common stock: (1) the proceeds received from the exercise of stock options, and (2) the amount of compensation cost associated with the stock awards for future service not yet recognized by the Company. Stock options are not included in the computation of diluted earnings (loss) per share when the stock option exercise price of an individual grant exceeds the average market price for the period.
Comprehensive Income	Comprehensive Income (Loss) Comprehensive income (loss) includes net income (loss) and all changes in the Company’s equity during a period from non-owner sources, which for the Company consists of unrealized gains and losses on available-for-sale marketable securities, net of tax.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of expenses during the period reported. The most significant management estimates include allowances for doubtful accounts, useful lives of property and equipment and intangible assets, fair value of future contractual operating lease obligations, incremental borrowing rates, potential sublease income and vacancy periods, accrued expenses, forfeiture rates and the likelihood of achieving performance criteria for stock-based awards, value of free courses earned by students that will be redeemed in the future, valuation of goodwill and intangible assets, and the provision for income taxes. Actual results could differ from those estimates.
Recently Adopted Accounting Standards And Not Yet Adopted	Recently Adopted Accounting Pronouncements In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”), which simplifies the accounting for share-based payments granted to nonemployees for goods and services. ASU 2018-07 aligns guidance on share-based payments to nonemployees with the requirements for share-based payments granted to employees, including determination of the measurement date and accounting for performance conditions and for share-based payments after vesting. The Company adopted this guidance as of January 1, 2019 with no material impact on its unaudited condensed consolidated financial statements. Recently Issued Accounting Standards Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new guidance revises the accounting requirements related to the measurement of credit losses and will require organizations to measure all expected credit losses for financial assets based on historical experience, current conditions, and reasonable and supportable forecasts about collectibility. Assets must be presented in the financial statements at the net amount expected to be collected. During 2019, the FASB issued additional ASUs amending certain aspects of ASU 2016-13. The guidance will be effective for the Company's annual and interim reporting periods beginning January 1, 2020, with early adoption permitted. The Company is evaluating the impact this standard will have on its financial condition, results of operations, and disclosures. Other ASUs issued by the FASB but not yet effective are not expected to have a material effect on the Company’s consolidated financial statements.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in the consolidated financial statements.

On August 1, 2018, the Company completed its merger with CEC, whereby the Company was deemed the acquirer in the business combination for accounting purposes in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Therefore, Strayer Education, Inc. is considered Strategic Education’s predecessor, and its historical financial statements prior to the merger date are reflected in this Quarterly Report on Form 10-Q as the historical financial statements of the Company. Accordingly, the financial results of the Company as of and for any periods ended prior to August 1, 2018 do not include the financial results of CEC and therefore are not directly comparable.

All information as of September 30, 2018 and 2019, and for the three and nine months ended September 30, 2018 and 2019 is unaudited but, in the opinion of management, contains all adjustments, consisting only of normal recurring adjustments, necessary to present fairly the condensed consolidated financial position, results of operations, and cash flows of the Company. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements at that date. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the full fiscal year.

Certain amounts in the prior period financial statements have been reclassified to conform to the current period's presentation. Effective during the first quarter of 2019, the Company made changes in its presentation of operating expenses and reclassified prior periods to conform to the current presentation. The Company determined that these changes aligned with its organizational structure and will improve comparability with several of its peer companies. There were no changes to total operating expenses or operating income as a result of these reclassifications. Below is a description of the nature of the costs included in the Company’s operating expense categories.

Instructional and support costs ("I&SC") generally contain items of expense directly attributable to activities of Strayer University and Capella University (the "Universities") that support students and learners. This expense category includes salaries and benefits of faculty and academic administrators, as well as admissions and administrative personnel who support and serve student interests. Instructional and support costs also include course development costs and costs associated with delivering course content, including educational supplies, facilities, and all other physical plant and occupancy costs, with the exception of costs attributable to the corporate offices. Bad debt expense incurred on delinquent student account balances is also included in instructional and support costs.

General and administration ("G&A") expenses include salaries and benefits of management and employees engaged in finance, human resources, legal, regulatory compliance, marketing and other corporate functions. Also included are the costs of advertising and production of marketing materials. General and administration expense also includes the facilities occupancy and other related costs attributable to such functions.

Restricted Cash

A significant portion of the Company’s revenues are funded by various federal and state government programs. The Company generally does not receive funds from these programs prior to the start of the corresponding academic term. The Company may be required to return certain funds for students who withdraw from the Universities during the academic term. The Company had approximately $5,000 and $2,000 of these unpaid obligations as of December 31, 2018 and September 30, 2019, respectively, which are recorded as restricted cash and included in other current assets in the unaudited condensed consolidated balance sheets.

As part of commencing operations in Pennsylvania in 2003, the Company is required to maintain a “minimum protective endowment” of at least $0.5 million in an interest-bearing account as long as the Company operates its campuses in the state. The Company holds these funds in an interest-bearing account which is included in other assets.

Tuition Receivable and Allowance for Doubtful Accounts

The Company records tuition receivable and contract liabilities for its students upon the start of the academic term or program. Tuition receivables are not collateralized; however, credit risk is minimized as a result of the diverse nature of the Universities' student bases and through the participation of the majority of the students in federally funded financial aid programs. An allowance for doubtful accounts is established primarily based upon historical collection rates by age of receivable, net of estimated recoveries. These collection rates incorporate historical performance based on a student’s current enrollment status and likelihood of future enrollment. The Company periodically assesses its methodologies for estimating bad debts in consideration of actual experience.

Leases

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 is intended to improve financial reporting of leasing transactions by requiring organizations that lease assets to recognize assets and liabilities for the rights and obligations created by leases with a term longer than 12 months. ASU 2016-02 also requires additional quantitative and qualitative disclosures surrounding the amount, timing, and uncertainty of cash flows arising from leases. During 2018 and 2019, the FASB issued additional ASUs amending certain aspects of ASU 2016-02. On January 1, 2019, the Company adopted the new accounting standard and all of the related amendments ("ASC 842") using the modified retrospective method. The Company applied ASU 2016-02 to all leases that had commenced as of January 1, 2019. In addition, as permitted by ASU 2016-02, comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company elected the package of practical expedients permitted under ASU 2016-02, which allowed the Company to not reassess prior conclusions regarding lease identification, lease classification, and initial direct costs under the new standard. As a result of adopting the new standard, the Company recognized a lease liability of $123 million and a right-of-use ("ROU") lease asset of $107 million on January 1, 2019. The standard did not materially impact the Company's condensed consolidated statements of income and cash flows.

The Company determines if an arrangement is a lease at inception. Leases with an initial term longer than 12 months are included in right-of-use lease assets, lease liabilities, and lease liabilities, non-current on the Company's condensed consolidated balance sheets. The Company combines lease and non-lease components for all leases.

ROU lease assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. ROU lease assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. As the implicit interest rate for most of the Company's leases cannot be readily determined, the Company uses its incremental borrowing rate based on information available at the commencement date in determining the present value of lease payments. Lease expense for lease payments is recognized on a straight-line basis over the lease term for operating leases.

Leases with an initial term of 12 months or less are not recorded on the balance sheet. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company subleases certain building space to third parties and sublease income is recognized on a straight-line basis over the lease term. See Note 7 for additional information.

Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price of an acquired business over the amount assigned to the assets acquired and liabilities assumed in a business combination. Indefinite-lived intangible assets, which include trade names, are recorded at fair value on their acquisition date. An indefinite life was assigned to the trade names because they have the continued ability to generate cash flows indefinitely.

Goodwill and the indefinite-lived intangible assets are assessed at least annually for impairment during the fourth quarter, or more frequently if events occur or circumstances change between annual tests that would more likely than not reduce the fair value of the respective reporting unit or indefinite-lived intangible asset below its carrying amount.

Finite-lived intangible assets that are acquired in business combinations are recorded at fair value on their acquisition dates and are amortized on a straight-line basis over the estimated useful life of the asset. Finite-lived intangible assets consist of student relationships.

The Company reviews its finite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such assets are not recoverable, a potential impairment loss is recognized to the extent the carrying amount of the assets exceeds the fair value of the assets.

Authorized Stock

The Company has authorized 32,000,000 shares of common stock, par value $0.01, of which 21,743,498 and 21,964,505 shares were issued and outstanding as of December 31, 2018 and September 30, 2019, respectively. The Company also has authorized 8,000,000 shares of preferred stock, none of which is issued or outstanding. Before any preferred stock may be issued in the future, the Board of Directors would need to establish the preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends, qualifications, and the terms or conditions of the redemption of the preferred stock.

In July 2019, the Company’s Board of Directors declared a regular, quarterly cash dividend of $0.50 per share of common stock. The dividend was paid on September 16, 2019.

Net Income Per Share

Net Income (Loss) Per Share

Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the periods. Diluted earnings (loss) per share reflects the potential dilution that could occur assuming conversion or exercise of all dilutive unexercised stock options, restricted stock, and restricted stock units. The dilutive effect of stock awards was determined using the treasury stock method. Under the treasury stock method, all of the following are assumed to be used to repurchase shares of the Company’s common stock: (1) the proceeds received from the exercise of stock options, and (2) the amount of compensation cost associated with the stock awards for future service not yet recognized by the Company. Stock options are not included in the computation of diluted earnings (loss) per share when the stock option exercise price of an individual grant exceeds the average market price for the period.

Comprehensive Income

Comprehensive Income (Loss)

Comprehensive income (loss) includes net income (loss) and all changes in the Company’s equity during a period from non-owner sources, which for the Company consists of unrealized gains and losses on available-for-sale marketable securities, net of tax.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of expenses during the period reported. The most significant management estimates include allowances for doubtful accounts, useful lives of property and equipment and intangible assets, fair value of future contractual operating lease obligations, incremental borrowing rates, potential sublease income and vacancy periods, accrued expenses, forfeiture rates and the likelihood of achieving performance criteria for stock-based awards, value of free courses earned by students that will be redeemed in the future, valuation of goodwill and intangible assets, and the provision for income taxes. Actual results could differ from those estimates.

Recently Adopted Accounting Standards And Not Yet Adopted

Recently Adopted Accounting Pronouncements

In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”), which simplifies the accounting for share-based payments granted to nonemployees for goods and services. ASU 2018-07 aligns guidance on share-based payments to nonemployees with the requirements for share-based payments granted to employees, including determination of the measurement date and accounting for performance conditions and for share-based payments after vesting. The Company adopted this guidance as of January 1, 2019 with no material impact on its unaudited condensed consolidated financial statements.

Recently Issued Accounting Standards Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new guidance revises the accounting requirements related to the measurement of credit losses and will require organizations to measure all expected credit losses for financial assets based on historical experience, current conditions, and reasonable and supportable forecasts about collectibility. Assets must be presented in the financial statements at the net amount expected to be collected. During 2019, the FASB issued additional ASUs amending certain aspects of ASU 2016-13. The guidance will be effective for the Company's annual and interim reporting periods beginning January 1, 2020, with early adoption permitted. The Company is evaluating the impact this standard will have on its financial condition, results of operations, and disclosures.

Other ASUs issued by the FASB but not yet effective are not expected to have a material effect on the Company’s consolidated financial statements.