Segment Reporting (Tables)

3 Months Ended

Jul. 31, 2014

Segment Reporting [Abstract]

Summary of Financial Information by Reportable Segment

Three Months Ended July 31, 2014

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	41,205	$	12,236		$	6,736	$	1,303		$	204,569
Western		61,176		19,578			7,971		7,737			331,505
Recycling		12,472		(54	)		1,065		(111	)		49,968
Other		26,534		637			596		409			70,560
Eliminations		—		(32,397	)		—		—			—
Total	$	141,387	$	—		$	16,368	$	9,338		$	656,602

Three Months Ended July 31, 2013

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating 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

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,
	2014		2013
Collection	$	60,011	$	58,213
Disposal		40,092		35,123
Power generation		1,940		2,041
Processing		2,859		2,951
Solid waste operations		104,902		98,328
Organics		10,662		9,877
Customer solutions		13,351		9,169
Recycling		12,472		11,184
Total revenues	$	141,387	$	128,558