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Document and Entity Information (USD $)
 6 Months Ended
Oct. 31, 2013
Document and Entity Information [Abstract]  
Entity Registrant Name Investors Real Estate Trust
Entity Central Index Key 0000798359
Current Fiscal Year End Date --04-30
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Public Float $ 770,620,552
Entity Common Stock, Shares Outstanding 105,871,424
Document Fiscal Year Focus 2014
Document Fiscal Period Focus Q2
Document Type 10-Q
Amendment Flag false
Document Period End Date Oct. 31, 2013