Supplemental Cash Flow Information (Tables)

9 Months Ended

12 Months Ended

Jan. 31, 2013

Apr. 30, 2012

Additional Cash Flow Information

	Nine months ended
	January 31, 2013		January 31, 2012
Cash interest paid	$	60,924	$	59,473
Cash taxes paid (recovered)		24,137		8,252
Assets acquired through non-cash capital leases		27,613		48,529

	For the year ended
	April 30, 2012		April 30, 2011		April 30, 2010
Cash interest paid	$	110,163	$	132,453	$	63,413
Cash taxes paid		15,584		21,986		21,205
Extinguishment of shareholder loan on redemption of capital stock		—		—		7,808
Assets acquired through non-cash capital leases		48,529		126,415		—
Assets under construction related to aircraft purchase contracts novated to lessors		—		—		45,306

Change in Cash Resulting From Changes in Operating Assets and Liabilities

Change in cash resulting from changes in operating assets and liabilities:

	Nine months ended
	January 31, 2013			January 31, 2012
Receivables, net of allowance	$	(15,564	)	$	(57,175	)
Income taxes		(3,117	)		4,278
Inventory		(9,226	)		1,839
Prepaid expenses		(2,856	)		(5,633	)
Payables and accruals		(10,781	)		30,297
Deferred revenue		(4,876	)		17,614
Other assets and liabilities		(73	)		(4,982	)
	$	(46,493	)	$	(13,762	)

Change in cash resulting from changes in operating assets and liabilities:

	For the year ended
	April 30, 2012			April 30, 2011			April 30, 2010
Receivables	$	(38,397	)	$	(37,614	)	$	(14,971	)
Income taxes		5,170			(8,693	)		25,341
Inventory		5,007			(8,021	)		2,866
Prepaid expenses		(4,335	)		6,894			(14,088	)
Payable and accruals		12,407			26,071			1,208
Deferred revenue		4,645			14,057			(1,519	)
Other assets and liabilities		(7,123	)		(5,388	)		(1,530	)
	$	(22,626	)	$	(12,694	)	$	(2,693	)