Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (Detail)

v3.7.0.1
Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]      
Net sales $ 1,921.6 $ 1,728.2 $ 1,656.9
Total Identifiable Assets 2,012.7 2,029.4  
General Corporate [Member]      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 718.9 774.4  
Worldwide Total [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,921.6 1,728.2 1,656.9
Total Identifiable Assets 2,012.7 2,029.4  
Segments Total [Member]      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 1,293.8 1,255.0  
North America [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,509.9 1,348.8 1,238.5
Total Identifiable Assets 953.1 925.1  
Australia [Member]      
Segment Reporting Information [Line Items]      
Net sales 252.5 228.4 267.7
Total Identifiable Assets 237.0 232.4  
New Zealand [Member]      
Segment Reporting Information [Line Items]      
Net sales 73.3 61.4 64.7
Total Identifiable Assets 31.8 26.5  
Other Countries [Member]      
Segment Reporting Information [Line Items]      
Net sales 85.9 89.6 $ 86.0
Total Identifiable Assets $ 71.9 $ 71.0