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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jan. 31, 2013
Apr. 30, 2012
Other assets    
Receivable arising from straight-lining of rents, allowance $ 1,310,000 $ 1,209,000
Accounts receivable, allowance 459,000 154,000
Intangible assets, accumulated amortization 26,599,000 47,813,000
Property and equipment, accumulated depreciation 1,598,000 1,423,000
Deferred charges and leasing costs, accumulated amortization 17,574,000 16,244,000
Statement [Line Items]    
Common Shares of Beneficial Interest, no par value (in dollars per share) $ 0 $ 0
Common Shares of Beneficial Interest, shares issued (in shares) 94,386,198 89,473,838
Common Shares of Beneficial Interest, shares outstanding (in shares) 94,386,198 89,473,838
Noncontrolling interests - Operating Partnership (in shares) 21,489,458 20,332,415
Preferred Class A [Member]
    
Statement [Line Items]    
Preferred Shares of Beneficial Interest, no par value (in dollars per share) $ 0 $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) 1,150,000 1,150,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) 1,150,000 1,150,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference 28,750,000 28,750,000
Preferred Class B [Member]
    
Statement [Line Items]    
Preferred Shares of Beneficial Interest, no par value (in dollars per share) $ 0 $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) 4,600,000 4,600,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) 0 0
Preferred Shares of Beneficial Interest, aggregate liquidation preference $ 115,000,000 $ 115,000,000