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Segment Information - Percentage of Total Sales by Product Group (Details) - Sales	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	24.00%	24.00%	26.00%
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	21.00%	22.00%	20.00%	20.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	13.00%	13.00%	13.00%
Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	11.00%	12.00%	10.00%
Fall Protection [Member]
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	9.00%	8.00%	9.00%
Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	4.00%	7.00%	5.00%
Other
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	17.00%	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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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