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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Other assets |  |
Receivable arising from straight-lining of rents, allowance | $ 796 | $ 830
Accounts receivable, allowance | 248 | 563
Intangible assets, accumulated amortization | 24,071 | 27,708
Property and equipment, accumulated depreciation | 2,041 | 1,673
Deferred charges and leasing costs, accumulated amortization | 21,068 | 18,714
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) | 109,019,341 | 101,487,976
Common Shares of Beneficial Interest, shares outstanding (in shares) | 109,019,341 | 101,487,976
Noncontrolling interests - Operating Partnership (in shares) | 21,093,445 | 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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