ACQUISITIONS (Additional Information) (Details) (Toledo Refinery [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Mar. 01, 2011 bbl	Apr. 30, 2013	Apr. 30, 2012
Business Acquisition [Line Items]
Throughput capacity of plant (in barrels per day)	170,000
Purchase price prior to certain adjustments	$ 400,000
Purchase price after adjustments	784,818
Cash paid	200,000
Seller promissory note	200,000
Estimated fair value of contingent consideration	125,000
Payment past due (in days)	120 days
Participation payment of purchased assets as a percentage of EBITDA	25.00%
Contingent consideration paid		21,357	103,643
Toldeo inventory note payable	299,645
Toledo Inventory Note Payable [Member]
Business Acquisition [Line Items]
Toldeo inventory note payable	299,645
Stated interest rate range, minimum	7.50%
Crude oil inventory purchased	338,395
Crude oil revenue	$ 369,999
Toledo Inventory Note Payable [Member] | LIBOR [Member]
Business Acquisition [Line Items]
Basis spread on variable rate	5.50%