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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Cash Flows from Operating Activities:    
Net loss $ (11,771) $ (40,946)
Adjustments to reconcile net loss to net cash provided by operating activities:    
(Income) loss from discontinued operations, net of tax (284) 779
Loss on disposal of discontinued operations, net of tax 378  
Gain on sale of property and equipment (608) (408)
Depreciation and amortization 45,261 43,244
Depletion of landfill operating lease obligations 7,710 7,358
Interest accretion on landfill and environmental remediation liabilities 3,084 2,756
Loss on divestiture   353
Development project charge 1,440  
Amortization of discount on second lien notes and senior subordinated notes 180 568
Loss from equity method investments 998 3,311
Gain on sale of equity method investment (593)  
Loss on derivative instruments 208 3,871
Loss on debt extinguishment   15,584
Stock-based compensation and related severance expense 1,851 1,840
Excess tax benefit on the vesting of share based awards   (98)
Deferred income taxes 1,088 (4,057)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable (1,135) (1,544)
Accounts payable (9,975) (110)
Prepaid expenses, inventories and other assets (2,730) (645)
Accrued expenses and other liabilities 2,576 (685)
Net cash provided by operating activities 37,678 31,171
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (8,519) (25,106)
Payments on landfill operating lease contracts (6,052) (5,726)
Payment for capital related to divestiture   (618)
Investments in unconsolidated entities (2,107) (1,000)
Proceeds from sale of equity method investment 2,845  
Proceeds from sale of property and equipment 1,248 781
Net cash used in investing activities (49,256) (74,985)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 120,890 334,497
Principal payments on long-term debt (107,834) (320,483)
Payment of tender premium and costs on second lien notes   (10,743)
Payments of financing costs (404) (4,572)
Net proceeds from the sale of Class A common stock   42,184
Excess tax benefit on the vesting of share based awards   98
Contributions from noncontrolling interest holders   1,195
Net cash provided by financing activities 12,652 42,176
Discontinued Operations:    
Net cash used in operating activities (201) (645)
Net cash provided by (used in) investing activities 84 (1,139)
Net cash used in discontinued operations (117) (1,784)
Net increase (decrease) in cash and cash equivalents 957 (3,422)
Cash and cash equivalents, beginning of period 1,755 4,534
Cash and cash equivalents, end of period 2,712 1,112
Cash paid during the period for:    
Interest 19,506 26,390
Income taxes, net of refunds 649 97
Summary of entities acquired in purchase business combinations:    
Fair value of net assets acquired 9,996 27,936
Common stock issued   2,650
Other non-cash consideration 483  
Cash paid, net of cash acquired 8,490 25,106
Holdbacks to sellers and contingent consideration 1,023 180
Property, plant and equipment acquired through lease obligations 2,301  
Acquisition [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (2,440) (528)
Growth [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (4,309) (10,356)
Maintenance [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment $ (29,922) $ (32,432)