Immaterial Restatement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Jun. 30, 2013
Accounting Changes And Error Corrections [Abstract]
Increase in the carrying value of strategic investments	$ 1.2

The increase (decrease) of the value of strategic investment due to correction of previously recorded valuation.

No definition available.

Name:	srdx_IncreaseDecreaseOfStrategicInvestmentsDueToErrorCorrection
Namespace Prefix:	srdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration