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Supplemental Cash Flow Information
 9 Months Ended
Jan. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental cash flow information: 
 
Nine months ended
 
January 31, 2013
 
January 31, 2014
Cash interest paid
$
60,924

 
$
82,135

Cash taxes paid
24,137

 
22,458

Assets acquired through capital leases
27,613

 
56,963


Change in cash resulting from changes in operating assets and liabilities: 
 
Nine months ended
 
January 31, 2013
 
January 31, 2014
Receivables, net of allowance
$
(15,581
)
 
$
41,060

Income taxes
(3,147
)
 
(1,839
)
Inventories
(9,226
)
 
(14,654
)
Prepaid expenses
(2,813
)
 
(6,540
)
Payables and accruals
(10,905
)
 
(11,980
)
Deferred revenue
(4,852
)
 
24,778

Other assets and liabilities
218

 
(848
)
 
$
(46,306
)
 
$
29,977