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Capital Management and Dividends - Additional Information (Detail)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
USD ($)
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Jun. 30, 2014
AUD
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Mar. 31, 2015
USD ($)
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Mar. 31, 2014
USD ($)
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| Equity [Abstract] | ||||
| Percentage of stock buyback program authorized | 5.00%jhx_PercentageOfStockRepurchaseProgramAuthorized | 5.00%jhx_PercentageOfStockRepurchaseProgramAuthorized | ||
| Aggregate number of common stock repurchased and cancelled | 715,000jhx_AggregateNumberOfSharesAcquired | 715,000jhx_AggregateNumberOfSharesAcquired | 0jhx_AggregateNumberOfSharesAcquired | |
| Aggregate cost of common stock repurchased and cancelled | $ 9.1us-gaap_TreasuryStockValueAcquiredCostMethod | 9.8us-gaap_TreasuryStockValueAcquiredCostMethod | $ 9.1us-gaap_TreasuryStockValueAcquiredCostMethod | $ 22.1us-gaap_TreasuryStockValueAcquiredCostMethod |
| Average price paid per share of common stock repurchased and cancelled | $ 12.73us-gaap_TreasuryStockAcquiredAverageCostPerShare | 13.69us-gaap_TreasuryStockAcquiredAverageCostPerShare | ||
| X | ||||||||||
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- Definition
Aggregate number of shares acquired under a stock repurchase plan. No definition available.
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| X | ||||||||||
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- Definition
Percentage of stock repurchase program authorized. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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