Commitments and Contingencies (Details)	12 Months Ended
Dec. 31, 2020
Commitments and Contingencies [Abstract]
Employee working period in SNI	5 months

Refers to the employees employment period in organization in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	sxt_EmployeesEmploymentPeriod
Namespace Prefix:	sxt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration