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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Jan. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Additional 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
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