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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Cash Flows from Operating Activities:      
Net loss $ (27,404) $ (54,463) $ (77,592)
Adjustments to reconcile net loss to net cash provided by operating activities:      
(Income) loss from discontinued operations, net of tax (284) 4,480 614
Loss (gain) on disposal of discontinued operations, net of tax 378   (725)
Gain on sale of property and equipment (840) (407) (1,004)
Depreciation and amortization 60,339 56,576 58,415
Depletion of landfill operating lease obligations 9,948 9,372 8,482
Interest accretion on landfill and environmental remediation liabilities 3,985 3,675 3,479
Asset impairment charge 7,455   40,746
Development project charge 1,394   131
Gain on settlement of acquisition related contingent consideration (1,058)    
Amortization of discount on senior subordinated notes and second lien notes 243 626 964
Loss from equity method investments 936 4,441 9,994
Impairment of equity method investment     10,680
Gain on sale of equity method investment (593)    
Loss on derivative instruments 280 4,512  
Loss on debt extinguishment   15,584 300
Stock-based compensation and related severance expense 2,404 2,516 1,855
Excess tax benefit on the vesting of share based awards   (96) (254)
Deferred income taxes 1,579 (3,543) 1,824
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable (3,418) 139 7,442
Accounts payable (186) 4,152 4,210
Prepaid expenses, inventories and other assets (463) 4,056 336
Accrued expenses and other liabilities (5,053) (7,714) (5,726)
Net cash provided by operating activities 49,642 43,906 64,171
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (8,305) (25,225) (2,102)
Additions to property, plant and equipment (43,326) (53,281) (57,834)
Payments on landfill operating lease contracts (6,505) (6,261) (6,616)
Payment for capital related to divestiture   (618)  
Investments in unconsolidated entities (2,107) (3,207) (5,045)
Proceeds from sale of equity method investment 3,442    
Proceeds from sale of property and equipment 1,524 883 1,492
Net cash used in investing activities (57,910) (89,455) (70,634)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 161,650 376,346 163,500
Principal payments on long-term debt (152,380) (360,858) (152,806)
Payment of tender premium and costs on second lien notes   (10,743)  
Payments of financing costs (405) (4,609) (1,592)
Net proceeds from the sale of Class A common stock   42,184  
Proceeds from the exercise of share based awards 143   337
Excess tax benefit on the vesting of share based awards   96 254
Contributions from noncontrolling interest holders   2,531 536
Net cash provided by (used in) financing activities 9,008 44,947 10,229
Discontinued Operations:      
Net cash used in operating activities (201) (1,037) (396)
Net cash provided by (used in) investing activities 170 (1,140) (653)
Net cash used in discontinued operations (31) (2,177) (1,049)
Net increase (decrease) in cash and cash equivalents 709 (2,779) 2,717
Cash and cash equivalents, beginning of period 1,755 4,534 1,817
Cash and cash equivalents, end of period 2,464 1,755 4,534
Cash paid during the period for:      
Interest 35,162 41,348 40,710
Income taxes, net of refunds 532 (253) 5,048
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Property, plant and equipment acquired through lease obligations 2,301    
Equipment contributed by noncontrolling interest holder     1,270
Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment $ (2,633) $ (1,746) $ (529)