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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, 2014
Apr. 30, 2013
Apr. 30, 2012
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) 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 provided by (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)
Change in restricted cash       
Payments of financing costs (405) (4,609) (1,592)
Payment of tender premium on second lien notes   (10,743)  
Proceeds from the exercise of share based awards 143   337
Net proceeds from the issuance of class A common stock   42,184  
Contributions from noncontrolling interest holder   2,531 536
Other   (4,513) 591
Net cash provided by (used in) financing activities 9,008 44,947 10,229
Net cash provided by (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
Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (2,633) (1,746) (529)
Parent [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (40,365) (5,319) 4,552
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired       
Additions to property, plant and equipment (1,675) (203) (574)
Payments on landfill operating lease contracts       
Investments in unconsolidated entities (2,107) (4,166) (2,740)
Proceeds from sale of equity method investment 3,442    
Proceeds from sale of property and equipment       
Net cash provided by (used in) investing activities (340) (4,369) (3,314)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 161,650 334,497 163,500
Principal payments on long-term debt (151,074) (359,342) (151,390)
Change in restricted cash       
Payments of financing costs (405)   (1,592)
Payment of tender premium on second lien notes   (10,743)  
Proceeds from the exercise of share based awards       
Net proceeds from the issuance of class A common stock   42,184  
Other   (4,513) 591
Intercompany borrowings 31,425 5,066 (10,079)
Net cash provided by (used in) financing activities 41,596 7,149 1,030
Net cash provided by (used in) discontinued operations       
Net increase (decrease) in cash and cash equivalents 891 (2,539) 2,268
Cash and cash equivalents, beginning of period 1,260 3,799 1,531
Cash and cash equivalents, end of period 2,151 1,260 3,799
Parent [Member] | Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment       
Guarantors [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 89,792 50,527 59,088
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (8,305) (25,225) (2,102)
Additions to property, plant and equipment (41,236) (48,058) (54,681)
Payments on landfill operating lease contracts (6,505) (6,261) (6,616)
Payment for capital related to divestiture   (618)  
Investments in unconsolidated entities    (2,707) (4,184)
Proceeds from sale of equity method investment       
Proceeds from sale of property and equipment 1,524 883 1,492
Net cash provided by (used in) investing activities (57,155) (83,732) (66,620)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings    41,849  
Principal payments on long-term debt (1,306) (1,516) (1,416)
Change in restricted cash       
Payments of financing costs       
Proceeds from the exercise of share based awards 143    
Intercompany borrowings (31,425) (5,066) 10,079
Net cash provided by (used in) financing activities (32,588) 35,267 8,663
Net cash provided by (used in) discontinued operations (31) (2,177) (1,049)
Net increase (decrease) in cash and cash equivalents 18 (115) 82
Cash and cash equivalents, beginning of period 253 368 286
Cash and cash equivalents, end of period 271 253 368
Guarantors [Member] | Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (2,633) (1,746) (529)
Non-Guarantors [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 215 (1,302) 531
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired       
Additions to property, plant and equipment (415) (5,020) (2,579)
Payments on landfill operating lease contracts       
Investments in unconsolidated entities    3,666 1,879
Proceeds from sale of equity method investment       
Proceeds from sale of property and equipment       
Net cash provided by (used in) investing activities (415) (1,354) (700)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings       
Principal payments on long-term debt       
Change in restricted cash       
Payments of financing costs       
Proceeds from the exercise of share based awards       
Contributions from noncontrolling interest holder   2,531 536
Intercompany borrowings       
Net cash provided by (used in) financing activities    2,531 536
Net cash provided by (used in) discontinued operations       
Net increase (decrease) in cash and cash equivalents (200) (125) 367
Cash and cash equivalents, beginning of period 242 367  
Cash and cash equivalents, end of period 42 242 367
Non-Guarantors [Member] | Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment       
Elimination [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities       
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired       
Additions to property, plant and equipment       
Payments on landfill operating lease contracts       
Investments in unconsolidated entities       
Proceeds from sale of equity method investment       
Proceeds from sale of property and equipment       
Net cash provided by (used in) investing activities       
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings       
Principal payments on long-term debt       
Change in restricted cash       
Payments of financing costs       
Proceeds from the exercise of share based awards       
Intercompany borrowings       
Net cash provided by (used in) financing activities       
Net cash provided by (used in) discontinued operations       
Net increase (decrease) in cash and cash equivalents       
Cash and cash equivalents, beginning of period       
Cash and cash equivalents, end of period        
Elimination [Member] | Acquisition [Member]
      
Cash Flows from Investing Activities:      
Additions to property, plant and equipment