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Acquisitions Completed (Detail)	12 Months Ended
Acquisitions Completed (Detail)	Apr. 28, 2012 American Veterinarian Supply Corp.	Apr. 28, 2012 Surgical Synergies Pty Ltd.	Apr. 28, 2012 Orthoplast	Apr. 30, 2011 DCC Healthcare	Apr. 30, 2011 ePet Records LLC	Apr. 24, 2010 Therapeutic Technologies	Apr. 24, 2010 Global Medical & Dental	Apr. 24, 2010 Empi Therapy Solutions	Apr. 24, 2010 Summit Sports Medical
Business Acquisition [Line Items]
Acquisition by segment	Veterinary supply	Rehabilitation supply	Rehabilitation supply	Rehabilitation supply	Veterinary supply	Rehabilitation supply	Dental supply	Rehabilitation supply	Rehabilitation supply

Description of a specific restructuring plan and related activities including the facts and circumstances leading to the restructuring or decision to exit an activity, and the expected completion date. This concept and related items would be utilized for each plan if multiple exit plans have been implemented in the period.

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