FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Jul. 31, 2012

Assets and Liabilities Measured at Fair Value on Recurring Basis

As of July 31, 2012 our assets and liabilities that are measured at fair value on a recurring basis and do not approximate their respective fair values included the following:

	Fair Value Measurement at July 31, 2012 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted assets	$	419	$	—	$	—
Liabilities:
Interest rate derivatives	$	—	$	3,626	$	—

As of July 31, 2011 our assets and liabilities that are measured at fair value on a recurring basis and do not approximate their respective fair values included the following:

	Fair Value Measurement at July 31, 2011 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted assets	$	329	$	—	$	—
Liabilities:
Commodity derivatives	$	—	$	47	$	—