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IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Identified intangible assets (included in intangible assets) [Roll Forward] |  |  |
Gross carrying amount | $ 45,823,000 | $ 48,181,000 |
Accumulated amortization | (19,610,000) | (17,286,000) |
Net carrying amount | 26,213,000 | 30,895,000 |
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Gross carrying amount | 82,000 | 127,000 |
Accumulated amortization | (61,000) | (90,000) |
Net carrying amount | 21,000 | 37,000 |
Other Identified Intangible Assets [Member] |  |  |
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Amortization of intangible assets | 5,000,000 | 7,400,000 | $ 4,200,000
Estimated annual amortization [Abstract] |  |  |
2016 | 4,000,000 |  |
2017 | 3,698,000 |  |
2018 | 3,469,000 |  |
2019 | 3,433,000 |  |
2020 | 3,390,000 |  |
Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Amortization of intangible assets | 24,000 | $ 25,000 | $ 29,000
Estimated annual amortization [Abstract] |  |  |
2016 | 22,000 |  |
2017 | 11,000 |  |
2018 | (3,000) |  |
2019 | (3,000) |  |
2020 | $ (1,000) |  |

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- Definition Accumulated amount of amortization of liabilities, excluding financial liabilities, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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