Operating Segment Information and Concentrations of Risk - Summary of Gross Sales by Major Customers (Detail) - Customer A [Member] - USA & Europe Fiber Cement [Member] - USD ($) $ in Millions |
12 Months Ended | ||
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Mar. 31, 2016 |
Mar. 31, 2015 |
Mar. 31, 2014 |
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| Segment Reporting Information [Line Items] | |||
| Gross Sales of Major Customers | $ 197.0 | $ 177.4 | $ 174.2 |
| Gross sales percentage | 10.10% | 10.70% | 11.70% |
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- Definition Gross sales of the Company's major customers that individually account for over 10% of the Company's net sales in one or all of the past three fiscal years. No definition available.
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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. No definition available.
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