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STOCK BASED COMPENSATION (Details) (USD $)	12 Months Ended
STOCK BASED COMPENSATION (Details) (USD $)	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 332,000,000	$ 404,000,000
2008 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares (in shares)	2,000,000
Terms of Award	ten year period
Long Term Incentive Plan 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan award description	Three-Year Average Annual Total Shareholder Return
Long Term Incentive Plan 2012 [Member] \| Unrestricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards payable (in hundredths)	50.00%
Long Term Incentive Plan 2012 [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards payable (in hundredths)	50.00%
Trustee Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 15,975	$ 7,560	$ 8,650

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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