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Segment Information - Revenue from External Customers by Products and Services (Details) - Sales | 3 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 23.00% | 18.00%
Fire Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 21.00% | 22.00%
Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 13.00% | 14.00%
Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 12.00% | 14.00%
Fire and Rescue Helmets |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Fall Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 4.00% | 4.00%
Other |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 22.00% | 23.00%

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