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Investments In Unconsolidated Entities (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended					9 Months Ended				1 Months Ended	3 Months Ended			1 Months Ended			1 Months Ended
	Jan. 31, 2012	Jan. 31, 2012	Jan. 31, 2013 Recycle Rewards Inc [Member]	Apr. 30, 2012 Recycle Rewards Inc [Member]	Jan. 31, 2013 AGreen [Member]	Apr. 30, 2012 AGreen [Member]	Jan. 31, 2013 GreenerU [Member]	Apr. 30, 2012 GreenerU [Member]	Jan. 31, 2013 Evergreen National Indemnity Company [Member]	Apr. 30, 2012 Evergreen National Indemnity Company [Member]	May 31, 2012 Green Fiber [Member]	Jan. 31, 2012 Green Fiber [Member]	Jan. 31, 2013 Green Fiber [Member]	Apr. 30, 2012 Green Fiber [Member]	May 31, 2011 Tompkins County Recycling LLC [Member]	Jan. 31, 2013 Tompkins County Recycling LLC [Member]	Apr. 30, 2012 Tompkins County Recycling LLC [Member]	May 31, 2011 Tompkins County Recycling LLC [Member] FCRLLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity-method ownership interest													50.00%		50.00%		50.00%	50.00%
Guaranty issued													$ 2,200
Fair value of guaranty													264
Goodwill impairment charge												5,090
Impairment of equity method investment	10,680	10,680										10,680
Equity contribution											500				285			285
Equity method investments													2,638	6,502		307	292
Cost method investments			4,479	4,479	350	350	1,000	500	10,657	10,657
Ownership interest			6.00%	6.20%	11.90%	11.90%	6.30%	4.20%	19.90%	19.90%
Payments to acquire cost method investments							$ 500

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