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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,099,359	$ 1,068,069
Less: accumulated depreciation and amortization	695,935	645,567
Property, plant and equipment, net	403,424	422,502
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,445	20,722
Landfills [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	496,515	475,855
Landfill operating lease contracts [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	115,867	109,363
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	134,787	133,330
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	117,193	120,314
Rolling Stock [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	128,155	128,038
Containers [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 85,397	$ 80,447