Accounts and Other Receivables - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
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| Receivables [Abstract] | ||
| Balance at beginning of period | $ 0.8 | $ 1.0 |
| Adjustment to provision | 0.5 | (0.1) |
| Write-offs, net of recoveries | (0.2) | (0.1) |
| Balance at end of period | $ 1.1 | $ 0.8 |
| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in the allowance for doubtful accounts. No definition available.
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| X | ||||||||||
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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