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Business Segments (Narrative) (Details) - Geographic Concentration Risk | 12 Months Ended
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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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