Fair Value of Financial Instruments (Tables)

3 Months Ended

Jul. 31, 2013

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

As of July 31, 2013 our assets and liabilities that are measured at fair value on a recurring basis included the following:

	Fair Value Measurement at July 31, 2013 Using:
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted assets	$	538	$	—	$	—
Liabilities:
Interest rate derivatives	$	—	$	3,137	$	—

As of April 30, 2013 our assets and liabilities that are measured at fair value on a recurring basis included the following:

	Fair Value Measurement at April 30, 2013 Using:
	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted assets	$	545	$	—	$	—
Liabilities:
Interest rate derivatives	$	—	$	4,229	$	—