Key Accounting Policies - Additional Information (Detail)	3 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]
Product sales payment terms, general minimum	30 days
Product sales payment terms, general maximum	45 days

Generally the maximum payment terms for products sold to customers.

No definition available.

Name:	srdx_CreditSaleRecoveryGeneralMaximumPeriod
Namespace Prefix:	srdx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration