Other Financing Charges

9 Months Ended

12 Months Ended

Jan. 31, 2013

Apr. 30, 2012

Other Financing Charges

10. Other financing charges:

	Nine months ended
	January 31, 2013			January 31, 2012
Amortization of deferred financing costs	$	(5,268	)	$	(4,953	)
Net loss on fair value of derivative financial instruments		(6,683	)		(7,892	)
Amortization of guaranteed residual values		(1,868	)		(1,354	)
Interest expense		(11,600	)		(4,340	)
Interest income		10,219			9,606
Other		(7,265	)		(5,084	)
	$	(22,465	)	$	(14,017	)

16. Other financing charges:

	For the year ended
	April 30, 2012			April 30, 2011			April 30, 2010
Write-off of unamortized transaction costs on the senior facility agreement	$	—		$	47,140		$	—
Amortization of deferred financing costs		6,851			7,151			4,036
Loss on interest rate swap		—			8,656			1,182
Net loss (gain) on fair value of derivative financial instruments		5,380			(5,567	)		12,935
Amortization of guaranteed residual values		1,852			1,248			542
Interest expense		8,542			6,672			10,616
Interest income		(12,928	)		(10,802	)		(10,641	)
Other		5,365			12,538			2,789
	$	15,062		$	67,036		$	21,459