Commitments and Contingencies (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2020
Commitments and Contingencies [Abstract]
Term in which decision becomes final after issuance	30 days
Number of days available for Agar to file petition	10 days
Employee working period in SNI		5 months

Refers to number of days the Court of Appeal's decision becomes final after issuance in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

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