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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Jul. 31, 2013 | Apr. 30, 2013
--- | --- | ---
Other assets |  |
Receivable arising from straight-lining of rents, allowance | $ 752,000 | $ 830,000
Accounts receivable, allowance | 388,000 | 563,000
Intangible assets, accumulated amortization | 24,019,000 | 27,708,000
Property and equipment, accumulated depreciation | 1,757,000 | 1,673,000
Deferred charges and leasing costs, accumulated amortization | 19,810,000 | 18,714,000
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) | 104,226,469 | 101,487,976
Common Shares of Beneficial Interest, shares outstanding (in shares) | 104,226,469 | 101,487,976
Noncontrolling interests - Operating Partnership (in shares) | 21,848,891 | 21,635,127
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) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 | $ 115,000,000

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