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)

v3.19.1
Operating Segment Information and Concentrations of Risk - Summary of Geographical Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]      
Net sales $ 2,506.6 $ 2,054.5 $ 1,921.6
Total Identifiable Assets 4,032.6 2,351.0  
Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 2,345.7 1,459.9  
General Corporate      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 1,686.9 891.1  
North America      
Segment Reporting Information [Line Items]      
Net sales 1,691.5 1,592.8 1,509.9
North America | Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 1,294.6 1,103.6  
Australia      
Segment Reporting Information [Line Items]      
Net sales 315.1 301.1 252.5
Australia | Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 235.4 242.6  
Germany      
Segment Reporting Information [Line Items]      
Net sales 137.1 2.1 2.7
Germany | Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 512.3 0.5  
New Zealand      
Segment Reporting Information [Line Items]      
Net sales 79.1 76.8 73.3
New Zealand | Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets 39.2 34.8  
Other Countries      
Segment Reporting Information [Line Items]      
Net sales 283.8 81.7 $ 83.2
Other Countries | Operating Segments      
Segment Reporting Information [Line Items]      
Total Identifiable Assets $ 264.2 $ 78.4