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Segment Information - Percentage of Total Sales by Product Group (Details) - Sales	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	26.00%	28.00%
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	19.00%	20.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	12.00%
Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	9.00%
Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	9.00%
Fire & Rescue Helmets
Revenue from External Customer [Line Items]
Concentration risk percentage	5.00%	5.00%
Other
Revenue from External Customer [Line Items]
Concentration risk percentage	16.00%	17.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ 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
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

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+ References

No definition available.

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