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Business Acquisitions - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Property
Jan. 31, 2013
Property
Business Acquisition [Line Items]    
Business acquisition, advanced customer billings $ 483,000  
Business acquisition, stock value   2,650,000
Recycling [Member]
    
Business Acquisition [Line Items]    
Total consideration 425,000  
Membership interest acquired 50.00%  
Western Region [Member]
    
Business Acquisition [Line Items]    
Number of businesses acquired 3 4
Total consideration 2,541,000 5,384,000
Business acquisition, cash 2,026,000 4,854,000
Business acquisition, advanced customer billings 36,000  
Business acquisition, hold backs to sellers 479,000 530,000
Eastern Region [Member]
    
Business Acquisition [Line Items]    
Total consideration 4,298,000 22,650,000
Business acquisition, cash 4,089,000 20,000,000
Business acquisition, advanced customer billings 209,000  
Business acquisition, stock value   2,650,000
Deferred tax liability recorded through goodwill   5,242,000
Eastern Region [Member] | Class A Common Stock [Member]
    
Business Acquisition [Line Items]    
Business acquisition, shares   625
Other Region [Member]
    
Business Acquisition [Line Items]    
Total consideration 2,494,000  
Business acquisition, cash 1,320,000  
Business acquisition, hold backs to sellers 330,000  
Business combination consideration transferred contingent consideration 844,000  
Minimum [Member]
    
Business Acquisition [Line Items]    
Acquired intangible assets, amortization period 5 years 5 years
Maximum [Member]
    
Business Acquisition [Line Items]    
Acquired intangible assets, amortization period 10 years 10 years
Maximum [Member] | Other Region [Member]
    
Business Acquisition [Line Items]    
Business combination consideration transferred contingent consideration, upper limit $ 1,000,000