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Voluntary Separation Program (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2022 USD ($)
Voluntary Separation Program [Abstract]
Personnel costs	$ 56,996

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- Definition

Voluntary Separation Program

+ References

No definition available.

+ Details

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Namespace Prefix:	seic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Voluntary Separation Program, Personnel Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	seic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration