Segment Reporting (Tables)

6 Months Ended

Oct. 31, 2014

Segment Reporting [Abstract]

Summary of Financial Information by Reportable Segment

Three Months Ended October 31, 2014

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income		Total assets
Eastern	$	42,052	$	12,541		$	7,014	$	2,200	$	206,860
Western		60,014		19,624			7,345		7,322		332,748
Recycling		13,261		(50	)		1,081		380		52,218
Other		26,014		667			588		162		69,968
Eliminations		—		(32,782	)		—		—		—
Total	$	141,341	$	—		$	16,028	$	10,064	$	661,794

Three Months Ended October 31, 2013

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	40,305	$	10,043		$	6,691	$	2,203		$	205,181
Western		58,224		18,892			7,311		7,211			348,223
Recycling		11,506		(26	)		1,074		(152	)		49,884
Other		22,261		491			593		188			75,225
Eliminations		—		(29,400	)		—		—			—
Total	$	132,296	$	—		$	15,669	$	9,450		$	678,513

Six Months Ended October 31, 2014

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income		Total assets
Eastern	$	83,257	$	24,777		$	13,750	$	3,503	$	206,860
Western		121,190		39,202			15,316		15,060		332,748
Recycling		25,733		(104	)		2,146		269		52,218
Other		52,548		1,304			1,184		571		69,968
Eliminations		—		(65,179	)		—		—		—
Total	$	282,728	$	—		$	32,396	$	19,403	$	661,794

Six Months Ended October 31, 2013

Segment	Outside revenues		Inter-company revenue			Depreciation and amortization		Operating income (loss)			Total assets
Eastern	$	78,926	$	20,474		$	13,072	$	3,829		$	205,181
Western		115,571		38,153			14,545		14,107			348,223
Recycling		22,690		(31	)		2,139		(195	)		49,884
Other		43,667		1,003			1,110		1,447			75,225
Eliminations		—		(59,599	)		—		—			—
Total	$	260,854	$	—		$	30,866	$	19,188		$	678,513

Summary of Revenue Attributable to Services Provided by Company

Amounts of our total revenue attributable to services provided for the three and six months ended October 31, 2014 and 2013 are as follows:

	Three Months Ended October 31,				Six Months Ended  October 31,
	2014		2013		2014		2013
Collection	$	60,338	$	58,765	$	120,349	$	116,978
Disposal		39,665		37,374		79,758		72,497
Power generation		1,867		1,980		3,806		4,022
Processing		2,582		2,679		5,441		5,631
Solid waste operations		104,452		100,798		209,354		199,128
Organics		10,139		9,474		20,801		19,350
Customer solutions		13,489		10,518		26,840		19,686
Recycling		13,261		11,506		25,733		22,690
Total revenues	$	141,341	$	132,296	$	282,728	$	260,854