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RETIREMENT PLANS (Details) (USD $) | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
RETIREMENT PLANS [Abstract] |  |  |
Age threshold for 401 (k) plan | 21 |  |
Requisite service period to participate in contribution plan | P6M |  |
Hours worked per calendar year established as threshold for 401(k) plan (in hours) | 1,000 |  |
Maximum contribution each employee towards profit sharing plan (in hundredths) | 3.50% |  |
Maximum contribution each employee, towards 401(k) plan (in hundredths) | 4.00% |  |
Total contribution percentage in profit sharing and 401(k) plan (in hundredths) | 7.50% |  |
Employer contribution towards profit sharing plan and 401(K) plan | $ 912,000 | $ 871,000 | $ 598,000

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- Definition The minimum required hours per calendar year worked to participate in defined contribution 401(k) plan. + References No definition available. + Details
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- Definition The maximum total percentage per employee, by the terms of the plan, that the employer may contribute to a profit sharing plan and defined contribution plan . + References No definition available. + Details
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- Details
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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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