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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 37,678 $ 31,171
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (8,519) (25,106)
Payments on landfill operating lease contracts (6,052) (5,726)
Payment for capital related to divestiture   (618)
Investments in unconsolidated entities (2,107) (1,000)
Proceeds from sale of equity method investment 2,845  
Proceeds from sale of property and equipment 1,248 781
Net cash provided by (used in) investing activities (49,256) (74,985)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 120,890 334,497
Principal payments on long-term debt (107,834) (320,483)
Payment of tender premium and costs on second lien notes   (10,743)
Payments of financing costs (404) (4,572)
Net proceeds from the sale of Class A common stock   42,184
Excess tax benefit on the vesting of share based awards   98
Contributions from noncontrolling interest holders   1,195
Net cash provided by financing activities 12,652 42,176
Net cash provided by (used in) discontinued operations (117) (1,784)
Net increase (decrease) in cash and cash equivalents 957 (3,422)
Cash and cash equivalents, beginning of period 1,755 4,534
Cash and cash equivalents, end of period 2,712 1,112
Acquisition [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (2,440) (528)
Growth [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (4,309) (10,356)
Maintenance [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (29,922) (32,432)
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (31,037) (3,983)
Cash Flows from Investing Activities:    
Investments in unconsolidated entities (2,107) (1,000)
Proceeds from sale of equity method investment 2,845  
Net cash provided by (used in) investing activities (642) (1,233)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 120,890 334,497
Principal payments on long-term debt (106,854) (319,365)
Payment of tender premium and costs on second lien notes   (10,743)
Payments of financing costs (404) (4,572)
Net proceeds from the sale of Class A common stock   42,184
Excess tax benefit on the vesting of share based awards   98
Intercompany borrowings 19,214 (39,862)
Net cash provided by financing activities 32,846 2,237
Net increase (decrease) in cash and cash equivalents 1,167 (2,979)
Cash and cash equivalents, beginning of period 1,260 3,799
Cash and cash equivalents, end of period 2,427 820
Parent [Member] | Maintenance [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (1,380) (233)
Guarantors [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 68,515 34,962
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (8,519) (25,106)
Payments on landfill operating lease contracts (6,052) (5,726)
Payment for capital related to divestiture   (618)
Investments in unconsolidated entities   (3,196)
Proceeds from sale of property and equipment 1,248 781
Net cash provided by (used in) investing activities (48,199) (72,063)
Cash Flows from Financing Activities:    
Principal payments on long-term debt (980) (1,118)
Intercompany borrowings (19,214) 39,862
Net cash provided by financing activities (20,194) 38,744
Net cash provided by (used in) discontinued operations (117) (1,784)
Net increase (decrease) in cash and cash equivalents 5 (141)
Cash and cash equivalents, beginning of period 253 368
Cash and cash equivalents, end of period 258 227
Guarantors [Member] | Acquisition [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (2,440) (528)
Guarantors [Member] | Growth [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (3,894) (5,471)
Guarantors [Member] | Maintenance [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (28,542) (32,199)
Non-Guarantors [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 200 192
Cash Flows from Investing Activities:    
Investments in unconsolidated entities   3,196
Net cash provided by (used in) investing activities (415) (1,689)
Cash Flows from Financing Activities:    
Contributions from noncontrolling interest holders   1,195
Net cash provided by financing activities   1,195
Net increase (decrease) in cash and cash equivalents (215) (302)
Cash and cash equivalents, beginning of period 242 367
Cash and cash equivalents, end of period 27 65
Non-Guarantors [Member] | Growth [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (415) (4,885)
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      
Payments on landfill operating lease contracts      
Payment for capital related to divestiture     
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      
Payment of tender premium and costs on second lien notes     
Payments of financing costs      
Net proceeds from the sale of Class A common stock     
Excess tax benefit on the vesting of share based awards     
Contributions from noncontrolling interest holders     
Intercompany borrowings      
Net cash provided by 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      
Elimination [Member] | Growth [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment      
Elimination [Member] | Maintenance [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment