Segment Information - Additional Information (Detail)	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2017 Segment	Mar. 31, 2018 Segment Business	Jun. 30, 2017 Segment
Segment Reporting Information [Line Items]
Number of primary businesses | Business		2
Number of reportable segments		5
Building Technologies & Solutions
Segment Reporting Information [Line Items]
Number of reportable segments	4		5