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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Cash Flows from Operating Activities:    
Net loss $ (163) $ (8,379)
Adjustments to reconcile net loss to net cash provided by operating activities-    
(Income) loss from discontinued operations, net of tax (329) 216
Loss on disposal of discontinued operations, net of tax 378  
Gain on sale of property and equipment (164) (46)
Depreciation and amortization 15,197 14,709
Depletion of landfill operating lease obligations 2,627 2,288
Interest accretion on landfill and environmental remediation liabilities 1,046 933
Amortization of discount on second lien notes and senior subordinated notes 59 259
Loss from equity method investments 977 1,766
Gain on derivative instruments (654)  
Stock-based compensation 631 675
Excess tax provision (benefit) on the vesting of share based awards 63 (205)
Deferred income taxes 260 565
Changes in assets and liabilities, net of effects of acquisitions and divestitures-    
Accounts receivable (5,588) (5,960)
Accounts payable 278 2,020
Prepaid expenses, inventories and other assets (2,179) 678
Accrued expenses and other liabilities 7,087 (1,797)
Net cash provided by operating activities 19,526 7,722
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (29) (3,150)
Additions to property, plant and equipment - acquisitions (1,072) (288)
Additions to property, plant and equipment - growth (1,785) (2,002)
Additions to property, plant and equipment - maintenance (11,622) (14,179)
Payments on landfill operating lease contracts (1,982) (1,814)
Payment for capital related to divestiture   (618)
Investments in unconsolidated entities (2,148) (1,000)
Proceeds from sale of property and equipment 284 265
Net cash used in investing activities (18,354) (22,786)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 29,890 62,310
Principal payments on long-term debt (29,310) (48,689)
Payments of financing costs (359) (96)
Excess tax (provision) benefit on the vesting of share based awards (63) 205
Contributions from noncontrolling interest holders   721
Net cash provided by (used in) financing activities 158 14,451
Discontinued Operations:    
Net cash used in operating activities (166) (201)
Net cash used in investing activities   (215)
Net cash used in discontinued operations (166) (416)
Net increase (decrease) in cash and cash equivalents 1,164 (1,029)
Cash and cash equivalents, beginning of period 1,755 4,534
Cash and cash equivalents, end of period 2,919 3,505
Cash (refunded) paid during the period for-    
Interest 1,902 11,230
Income taxes, net of refunds 720 (26)
Summary of entities acquired in purchase business combinations-    
Fair value of net assets acquired   3,500
Cash paid, net of cash acquired 29 3,150
Holdbacks to sellers   350
Property, plant and equipment acquired through lease obligations $ 2,301