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Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill (Parenthetical) (Detail) (Eastern Region [Member], BBI Waste Industries and Bestway Disposal Services [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2013
Eastern Region [Member] | BBI Waste Industries and Bestway Disposal Services [Member]
Goodwill And Intangible Assets [Line Items]
Adjustment related to the December 5, 2012	$ 61
Business acquisition date	Dec. 05, 2012

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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-Publisher FASB

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete.

+ References

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