XML 45 R35.htm IDEA: XBRL DOCUMENT v3.8.0.1

Segmental reporting (Details)	Apr. 30, 2018 segment
Disclosure of operating segments [abstract]
Number of reportable segments	1

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfOperatingSegmentsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Reportable Segments

+ References

No definition available.

+ Details

Name:	smmt_NumberOfReportableSegments1
Namespace Prefix:	smmt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant