Segment Reporting (Tables)

3 Months Ended

Jul. 31, 2013

Segment Reporting [Abstract]

Summary of Financial Information by Reportable Segment

Segment data for the three months ended July 31, 2012 has been revised to properly align with internal management reporting, which has been modified in the three months ended July 31, 2013 to move organics services from the Eastern region to the Other segment to reflect changes in management structure as these services have become integral to service offerings across our broader geographic solid waste footprint.

Three Months Ended July 31, 2013

	Outside		Inter-company			Depreciation and		Operating
Segment	revenues		revenue			amortization		income (loss)			Total assets
Eastern	$	38,621	$	10,431		$	6,381	$	1,626		$	205,410
Western		57,347		19,261			7,233		6,896			346,986
Recycling		11,184		(5	)		1,065		(44	)		50,857
Other		21,406		512			518		1,259			71,491
Eliminations		—		(30,199	)		—		—			—
Total	$	128,558	$	—		$	15,197	$	9,737		$	674,744

Three Months Ended July 31, 2012

	Outside		Inter-company			Depreciation and		Operating
Segment	revenues		revenue (1)			amortization		income (loss)			Total assets
Eastern	$	33,807	$	8,135		$	6,537	$	(577	)	$	168,621
Western		52,553		16,758			6,421		6,245			347,735
Recycling		11,162		1			1,097		—			54,085
Other		20,116		1,215			654		139			72,833
Eliminations		—		(26,109	)		—		—			—
Total	$	117,638	$	—		$	14,709	$	5,807		$	643,274

Summary of Revenue Attributable to Services Provided by Company

Amounts of our total revenue attributable to services provided are as follows:

	Three Months Ended July 31,
	2013		2012
Collection	$	58,313	$	53,033
Disposal		35,123		30,967
Power generation		2,041		2,663
Processing		2,851		1,435
Solid waste operations		98,328		88,098
Organics		9,877		8,853
Customer solutions		9,169		9,525
Recycling		11,184		11,162
Total revenues	$	128,558	$	117,638