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Business Segments (Narrative) (Details) - Geographic Concentration Risk	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Sales | UNITED STATES
Concentration Risk [Line Items]
Concentration risk, percentage	87.30%	87.40%	85.20%
Sales | CANADA
Concentration Risk [Line Items]
Concentration risk, percentage	4.80%	5.20%	5.90%
Sales | AUSTRALIA
Concentration Risk [Line Items]
Concentration risk, percentage	5.20%	5.60%	6.90%
Goodwill and Intangible Assets | UNITED STATES
Concentration Risk [Line Items]
Concentration risk, percentage	96.50%	95.90%
Goodwill and Intangible Assets | AUSTRALIA
Concentration Risk [Line Items]
Concentration risk, percentage	3.50%	4.10%

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 275
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