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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash Flows from Operating Activities:    
Net loss $ (738) $ (29,471)
Adjustments to reconcile net loss to net cash provided by operating activities -    
(Income) loss from discontinued operations, net of tax (284) 451
Loss on disposal of discontinued operations, net of tax 378  
Gain on sale of property and equipment (389) (209)
Depreciation and amortization 30,866 29,279
Depletion of landfill operating lease obligations 5,491 4,878
Interest accretion on landfill and environmental remediation liabilities 2,068 1,858
Amortization of discount on second lien notes and senior subordinated notes 119 502
Loss from equity method investments 887 1,875
(Gain) loss on derivative instruments (25) 3,896
Loss on debt extinguishment   9,670
Stock-based compensation 1,209 1,306
Excess tax benefit on the vesting of share based awards   (188)
Deferred income taxes 504 907
Changes in assets and liabilities, net of effects of acquisitions and divestitures -    
Accounts receivable (5,782) (3,506)
Accounts payable (2,432) 4,617
Prepaid expenses, inventories and other assets (2,997) (246)
Accrued expenses and other liabilities (756) (2,851)
Net cash provided by operating activities 28,119 22,768
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (2,822) (4,635)
Additions to property, plant and equipment - acquisition (1,365) (417)
Additions to property, plant and equipment - growth (3,249) (8,198)
Additions to property, plant and equipment - maintenance (22,810) (24,776)
Payments on landfill operating lease contracts (3,471) (3,298)
Payment for capital related to divestiture   (618)
Investments in unconsolidated entities (2,148) (1,000)
Proceeds from sale of property and equipment 929 543
Net cash used in investing activities (34,936) (42,399)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 83,190 236,177
Principal payments on long-term debt (72,586) (227,028)
Change in restricted cash   (23,579)
Payment of tender premium and costs on second lien notes   (6,745)
Payments of financing costs (388) (4,329)
Net proceeds from the sale of Class A common stock   42,149
Excess tax benefit on the vesting of share based awards   188
Contributions from noncontrolling interest holders   1,195
Net cash provided by financing activities 10,216 18,028
Discontinued Operations:    
Net cash used in operating activities (201) (393)
Net cash used in investing activities   (637)
Net cash used in discontinued operations (201) (1,030)
Net increase (decrease) in cash and cash equivalents 3,198 (2,633)
Cash and cash equivalents, beginning of period 1,755 4,534
Cash and cash equivalents, end of period 4,953 1,901
Cash paid during the period for -    
Interest 17,577 22,234
Income taxes, net of refunds 622 71
Summary of entities acquired in purchase business combinations -    
Fair value of net assets acquired 4,594 4,761
Other non-cash consideration 245  
Cash paid, net of cash acquired 2,793 4,635
Holdbacks to sellers and contingent consideration 1,556 126
Property, plant and equipment acquired through lease obligations $ 2,301