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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Cash Flows from Operating Activities:      
Net (loss) income $ (54,463) $ (77,592) $ 38,428
Adjustments to reconcile net (loss) income to net cash provided by operating activities -      
Loss from discontinued operations, net of tax 4,480 614 2,198
Gain on disposal of discontinued operations, net of tax   (725) (43,590)
Gain on sale of assets     (3,502)
Gain on sale of property and equipment (407) (1,004) (470)
Depreciation and amortization 56,576 58,415 58,121
Depletion of landfill operating lease obligations 9,372 8,482 7,878
Interest accretion on landfill and environmental remediation liabilities 3,675 3,479 3,331
Asset impairment charge   40,746 3,654
Environmental remediation charge     549
Bargain purchase gain     (2,975)
Development project charge   131  
Amortization of premium on redeemed senior subordinated notes     (611)
Amortization of discount on second lien notes and senior subordinated notes 626 964 801
Loss from equity method investments 4,441 9,994 4,096
Impairment of equity method investment   10,680  
Loss on derivative instruments, net 4,512    
Loss on debt extinguishment 15,584 300 7,390
Stock-based compensation and related severance expense 2,516 1,855 1,592
Excess tax benefit on the vesting of share based awards (96) (254) (129)
Deferred income taxes (3,543) 1,824 (23,124)
Changes in assets and liabilities, net of effects of acquisitions and divestitures -      
Accounts receivable 139 7,442 (3,273)
Accounts payable 4,152 4,210 7,443
Prepaid expenses, inventories and other assets 4,056 336 3,861
Accrued expenses and other liabilities (7,759) (5,726) (13,459)
Net cash provided by operating activities 43,861 64,171 48,209
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (25,225) (2,102) (1,744)
Additions to property, plant and equipment - acquisitions (1,746) (529) (5)
Additions to property, plant and equipment - growth (12,192) (12,211) (2,803)
Additions to property, plant and equipment - maintenance (40,823) (45,463) (51,780)
Payments on landfill operating lease contracts (6,261) (6,616) (5,655)
Payment for capital related to divestiture (618)    
Investments in unconsolidated entities (3,207) (5,045)   
Purchase of gas rights     (1,608)
Proceeds from sale of assets     7,533
Proceeds from sale of property and equipment 883 1,492 959
Net cash used in investing activities (89,189) (70,474) (55,103)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 376,346 163,500 383,757
Principal payments on long-term debt (360,858) (152,806) (491,669)
Payment of tender premium and costs on second lien notes (10,743)    
Payments of financing costs (4,609) (1,592) (10,588)
Net proceeds from the sale of Class A common stock 42,184    
Proceeds from the exercise of share based awards   337 476
Excess tax benefit on the vesting of share based awards 96 254 129
Contributions from noncontrolling interest holders 2,531 536  
Net cash provided by (used in) financing activities 44,947 10,229 (117,895)
Discontinued Operations:      
Net cash used in operating activities (1,037) (396) (1,477)
Net cash (used in) provided by investing activities (1,361) (813) 129,453
Net cash used in financing activities     (3,405)
Net cash (used in) provided by discontinued operations (2,398) (1,209) 124,571
Net (decrease) increase in cash and cash equivalents (2,779) 2,717 (218)
Cash and cash equivalents, beginning of period 4,534 1,817 2,035
Cash and cash equivalents, end of period 1,755 4,534 1,817
Cash (refunded) paid during the period for -      
Interest 41,348 40,710 43,923
Income taxes, net of refunds (253) 5,048 1,480
Summary of entities acquired in purchase business combinations -      
Fair value of net assets acquired and goodwill 27,908 2,217 6,456
Common stock issued 2,650    
Bargain purchase gain     2,975
Cash paid, net of cash acquired 25,225 2,102 1,744
Notes payable, liabilities assumed and holdbacks to sellers 33 115 1,737
Equipment contributed by noncontrolling interest holder   $ 1,270