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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE SECURITIES TRUST
Prospectus Date rr_ProspectusDate May 01, 2016
Supplement [Text Block] dst_SupplementTextBlock
SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

Deutsche Real Estate Securities Income Fund
The following information replaces similar existing disclosure contained in the “PAST PERFORMANCE” section of the summary section of the fund’s prospectus:
CALENDAR YEAR TOTAL RETURNS (%) (Class A)

These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.


chart
    
  Returns Period ending
Best Quarter 8.93% March 31, 2014
Worst Quarter -7.33% June 30, 2015
Year-to-Date 6.77% March 31, 2016
Deutsche Real Estate Securities Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] dst_SupplementTextBlock
SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

Deutsche Real Estate Securities Income Fund
The following information replaces similar existing disclosure contained in the “PAST PERFORMANCE” section of the summary section of the fund’s prospectus:
CALENDAR YEAR TOTAL RETURNS (%) (Class A)

These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.


chart
    
  Returns Period ending
Best Quarter 8.93% March 31, 2014
Worst Quarter -7.33% June 30, 2015
Year-to-Date 6.77% March 31, 2016
Bar Chart [Heading] rr_BarChartHeading CALENDAR YEAR TOTAL RETURNS (%) (Class A)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These year-by-year returns do not include sales charges, if any, and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Returns Period ending
Best Quarter 8.93% March 31, 2014
Worst Quarter -7.33% June 30, 2015
Year-to-Date 6.77% March 31, 2016
Deutsche Real Estate Securities Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
2014 rr_AnnualReturn2014 19.86%
2015 rr_AnnualReturn2015 (4.33%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 6.77%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.93%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.33%)