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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Condensed Financial Statements, Captions [Line Items]      
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)    
Purchase of gas rights     (1,608)
Investments in unconsolidated entities (3,207) (5,045)   
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 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    
Contributions from noncontrolling interest holders 2,531 536  
Other 96 591 605
Intercompany borrowings         
Net cash provided by (used in) financing activities 44,947 10,229 (117,895)
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
Parent [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities (5,319) 4,552 (49,944)
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired         
Additions to property, plant and equipment - acquisitions         
Additions to property, plant and equipment - growth         
Additions to property, plant and equipment - maintenance (203) (574) (2,328)
Payments on landfill operating lease contracts         
Payment for capital related to divestiture       
Purchase of gas rights       
Investments in unconsolidated entities (4,166) (2,740) 548
Proceeds from sale of assets       
Proceeds from sale of property and equipment         
Net cash used in investing activities (4,369) (3,314) (1,780)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 334,497 163,500 382,899
Principal payments on long-term debt (359,342) (151,390) (490,254)
Payment of tender premium 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    
Contributions from noncontrolling interest holders        
Other 96 591 605
Intercompany borrowings 5,066 (10,079) 169,359
Net cash provided by (used in) financing activities 7,149 1,030 52,021
Net cash (used in) provided by discontinued operations         
Net (decrease) increase in cash and cash equivalents (2,539) 2,268 297
Cash and cash equivalents, beginning of period 3,799 1,531 1,234
Cash and cash equivalents, end of period 1,260 3,799 1,531
Guarantors [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 50,482 59,088 97,605
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 (7,172) (9,632) (2,803)
Additions to property, plant and equipment - maintenance (40,620) (44,889) (49,452)
Payments on landfill operating lease contracts (6,261) (6,616) (5,655)
Payment for capital related to divestiture (618)    
Purchase of gas rights     (1,608)
Investments in unconsolidated entities (2,707) (4,184)   
Proceeds from sale of assets     7,533
Proceeds from sale of property and equipment 883 1,492 959
Net cash used in investing activities (83,466) (66,460) (52,775)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 41,849    858
Principal payments on long-term debt (1,516) (1,416) (1,415)
Payment of tender premium on second lien notes       
Payments of financing costs         
Net proceeds from the sale of Class A common stock       
Contributions from noncontrolling interest holders        
Other         
Intercompany borrowings (5,066) 10,079 (169,359)
Net cash provided by (used in) financing activities 35,267 8,663 (169,916)
Net cash (used in) provided by discontinued operations (2,398) (1,209) 124,571
Net (decrease) increase in cash and cash equivalents (115) 82 (515)
Cash and cash equivalents, beginning of period 368 286 801
Cash and cash equivalents, end of period 253 368 286
Non-Guarantors [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities (1,302) 531 548
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired         
Additions to property, plant and equipment - acquisitions         
Additions to property, plant and equipment - growth (5,020) (2,579)   
Additions to property, plant and equipment - maintenance         
Payments on landfill operating lease contracts         
Payment for capital related to divestiture       
Purchase of gas rights       
Investments in unconsolidated entities 3,666 1,879 (548)
Proceeds from sale of assets       
Proceeds from sale of property and equipment         
Net cash used in investing activities (1,354) (700) (548)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings         
Principal payments on long-term debt         
Payment of tender premium on second lien notes       
Payments of financing costs         
Net proceeds from the sale of Class A common stock       
Contributions from noncontrolling interest holders 2,531 536  
Other         
Intercompany borrowings         
Net cash provided by (used in) financing activities 2,531 536   
Net cash (used in) provided by discontinued operations         
Net (decrease) increase in cash and cash equivalents (125) 367   
Cash and cash equivalents, beginning of period 367      
Cash and cash equivalents, end of period 242 367   
Elimination [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities         
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired         
Additions to property, plant and equipment - acquisitions         
Additions to property, plant and equipment - growth         
Additions to property, plant and equipment - maintenance         
Payments on landfill operating lease contracts         
Payment for capital related to divestiture       
Purchase of gas rights       
Investments in unconsolidated entities         
Proceeds from sale of assets       
Proceeds from sale of property and equipment         
Net cash used in investing activities         
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings         
Principal payments on long-term debt         
Payment of tender premium on second lien notes       
Payments of financing costs         
Net proceeds from the sale of Class A common stock       
Contributions from noncontrolling interest holders        
Other         
Intercompany borrowings         
Net cash provided by (used in) financing activities         
Net cash (used in) provided by discontinued operations         
Net (decrease) increase in cash and cash equivalents         
Cash and cash equivalents, beginning of period         
Cash and cash equivalents, end of period