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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 22,834 $ 28,119
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (314) (2,822)
Additions to property, plant and equipment (35,548) (26,059)
Payments on landfill operating lease contracts (2,454) (3,471)
Payments related to investments    (2,148)
Proceeds from sale of property and equipment 342 929
Net cash provided by (used in) investing activities (38,019) (34,936)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 80,700 83,190
Principal payments on long-term debt (65,070) (72,586)
Payments of financing costs (506) (388)
Proceeds from the exercise of share based awards 143  
Excess tax benefit on the vesting of share based awards 12  
Intercompany borrowings      
Net cash provided by (used in) financing activities 15,279 10,216
Net cash provided by (used in) discontinued operations 176 (201)
Net increase (decrease) in cash and cash equivalents 270 3,198
Cash and cash equivalents, beginning of period 2,464 1,755
Cash and cash equivalents, end of period 2,734 4,953
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (15,540) (25,720)
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired      
Additions to property, plant and equipment (598) (1,059)
Payments on landfill operating lease contracts      
Payments related to investments    (2,148)
Proceeds from sale of property and equipment      
Net cash provided by (used in) investing activities (598) (3,207)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings    83,190
Principal payments on long-term debt (64,802) (71,735)
Payments of financing costs (506) (388)
Proceeds from the exercise of share based awards 143  
Excess tax benefit on the vesting of share based awards 12  
Intercompany borrowings 81,137 21,145
Net cash provided by (used in) financing activities 15,984 32,212
Net cash provided by (used in) discontinued operations      
Net increase (decrease) in cash and cash equivalents (154) 3,285
Cash and cash equivalents, beginning of period 2,151 1,260
Cash and cash equivalents, end of period 1,997 4,545
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 38,246 53,481
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (314) (2,822)
Additions to property, plant and equipment (34,950) (24,575)
Payments on landfill operating lease contracts (2,454) (3,471)
Payments related to investments (310)   
Proceeds from sale of property and equipment 342 929
Net cash provided by (used in) investing activities (37,731) (31,304)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings 80,700   
Principal payments on long-term debt (268) (851)
Payments of financing costs      
Proceeds from the exercise of share based awards     
Excess tax benefit on the vesting of share based awards     
Intercompany borrowings (81,137) (21,145)
Net cash provided by (used in) financing activities (705) (21,996)
Net cash provided by (used in) discontinued operations 176 (201)
Net increase (decrease) in cash and cash equivalents (14) (20)
Cash and cash equivalents, beginning of period 271 253
Cash and cash equivalents, end of period 257 233
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 128 358
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired      
Additions to property, plant and equipment    (425)
Payments on landfill operating lease contracts      
Payments related to investments 310   
Proceeds from sale of property and equipment      
Net cash provided by (used in) investing activities 310 (425)
Cash Flows from Financing Activities:    
Proceeds from long-term borrowings      
Principal payments on long-term debt      
Payments of financing costs      
Proceeds from the exercise of share based awards     
Excess tax benefit on the vesting 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 438 (67)
Cash and cash equivalents, beginning of period 42 242
Cash and cash equivalents, end of period 480 175
Acquisition [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (45) (1,365)
Acquisition [Member] | Parent [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment      
Acquisition [Member] | Guarantor [Member]
    
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (45) (1,365)
Acquisition [Member] | Non-Guarantor [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      
Payments related to investments      
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      
Payments of financing costs      
Proceeds from the exercise of share based awards     
Excess tax benefit on the vesting 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