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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2025

Accounting Policies [Abstract]

Redeemable Noncontrolling Interest

Changes in the Company's redeemable non-controlling interests in consolidated VIEs are as follows:

						Redeemable Non-controlling Interests
Balance, December 31, 2024						$	—
Net income attributable to non-controlling interests						382
Capital contributions from non-controlling interests						18,470
Balance, September 30, 2025						$	18,852

Schedule of Calculation of Basic and Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for the three and nine months ended September 30, 2025 and 2024 are:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Net income			$	164,586					$	154,900					$	543,186					$	425,420
Less: Net income attributable to non-controlling interests			382						—						382						—
Net income attributable to SEI Investments Company			$	164,204					$	154,900					$	542,804					$	425,420
Shares used to compute basic earnings per common share			123,099,000						129,418,000						124,710,000						130,550,000
Dilutive effect of stock awards			3,226,000						1,253,000						2,974,000						1,280,000
Shares used to compute diluted earnings per common share			126,325,000						130,671,000						127,684,000						131,830,000
Basic earnings per common share			$	1.33					$	1.20					$	4.35					$	3.26
Diluted earnings per common share			$	1.30					$	1.19					$	4.25					$	3.23

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- References

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Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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