XML 29 R77.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Marketable Securities - Maturity Period (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | $ 34,874 | $ 37,121
Variable rate demand notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | $ 5,600 |
Variable rate demand notes | Minimum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Contractual maturities (in years) | 18 years |
Settlement basis period (in days) | 1 day |
Effective maturity period (in days) | 1 day |
Variable rate demand notes | Maximum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Contractual maturities (in years) | 26 years |
Settlement basis period (in days) | 7 days |
Effective maturity period (in days) | 7 days |

X
- Definition Represents the contractual maturity period of available for sale securities debt securities. + References No definition available. + Details
Name: | stra_AvailableForSaleSecuritiesDebtSecuritiesContractualMaturityPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the effective maturity period of available for sale securities debt securities. + References No definition available. + Details
Name: | stra_AvailableForSaleSecuritiesDebtSecuritiesEffectiveMaturityPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the settlement period of available for sale securities debt securities. + References No definition available. + Details
Name: | stra_AvailableForSaleSecuritiesDebtSecuritiesSettlementPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=stra_VariableRateDemandNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |