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Significant Accounting Policies - Assets Held for Sale Narrative (Details) $ in Millions	3 Months Ended
	Sep. 30, 2025 USD ($) facility
Accounting Policies [Abstract]
Number of facilities classified as held for sale | facility	1
Loss on assets classified as held for sale | $	$ 0.3

X

- Definition

Number Of Facilities Classified As Held-For-Sale

+ References

No definition available.

+ Details

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Namespace Prefix:	stra_
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Balance Type:	na
Period Type:	instant

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- References

No definition available.

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X

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-15

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