Acquisitions (Narrative) (Details) (USD $)	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Cash paid for acquired businesses, settlement of holdback liabilities and contingent consideration	$ 96,970,000	$ 20,695,000
Other intangible assets	21,066,000
Amounts payable under contingent payment agreements	7,500,000
FY12 Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired	6
Historical annual sales	73,000,000
Transaction and other integration costs	1,700,000
Net sales from current year acquisitions	43,000,000
Goodwill amount deductible for income tax	27,800,000
FY12 Acquisitions [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Other intangible assets	17,400,000
FY12 Acquisitions [Member] | Non-Competition Agreements [Member]
Business Acquisition [Line Items]
Other intangible assets	3,500,000
Pain [Member]
Business Acquisition [Line Items]
Number of locations	20
Historical annual sales	33,000,000
ABCO [Member]
Business Acquisition [Line Items]
Number of locations	12
Historical annual sales	35,000,000
Trade Accounts Receivable [Member] | FY12 Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of receivables acquired	7,900,000
Gross contractual amounts of acquired receivables	$ 8,600,000