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.

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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Information on Business Segments - Additional Information (Detail) - segment	8 Months Ended	12 Months Ended	16 Months Ended
	Aug. 23, 2016	Dec. 31, 2017	Dec. 31, 2017
Segment Reporting [Abstract]
Number of business segments		4
Net Earnings \| AWE Management Limited \| Equity Method Investment Risk \| Space
Segment Reporting Information [Line Items]
Concentration percentage	33.00%
Net Sales \| AWE Management Limited \| Equity Method Investment Risk \| Space
Segment Reporting Information [Line Items]
Concentration percentage		0.00%
Net Sales \| AWE Management Limited \| Segment Concentration Risk \| Space
Segment Reporting Information [Line Items]
Concentration percentage		100.00%	100.00%
Operating profit \| AWE Management Limited \| Segment Concentration Risk \| Space
Segment Reporting Information [Line Items]
Concentration percentage		51.00%	51.00%