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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
|
Mar. 31, 2014
Interest rate swap contracts [Member]
Interest_Rate_Swaps
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Mar. 31, 2014
Interest rate swap contracts [Member]
Derivatives not accounted for as hedges [Member]
|
Mar. 31, 2013
Interest rate swap contracts [Member]
Derivatives not accounted for as hedges [Member]
|
Oct. 31, 2013
Interest rate swap contracts [Member]
Contact One [Member]
|
Dec. 31, 2013
Interest rate swap contracts [Member]
Contract Two [Member]
|
Dec. 31, 2013
Interest rate swap contracts [Member]
Contract Three [Member]
|
Mar. 31, 2014
Foreign currency forward contracts [Member]
|
Mar. 31, 2014
Foreign currency forward contracts [Member]
Cash flow hedging [Member]
|
Mar. 31, 2014
Foreign currency forward contracts [Member]
Derivatives not accounted for as hedges [Member]
|
Mar. 31, 2013
Foreign currency forward contracts [Member]
Derivatives not accounted for as hedges [Member]
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| Fair Value Disclosures [Line Items] | ||||||||||||
| Debt outstanding | $ 0 | |||||||||||
| Notional amount of interest rate swap contracts | 258.7 | 25.0 | 100.0 | 125.0 | 25.0 | 50.0 | 25.0 | 25.0 | 124.0 | |||
| Number of additional interest rate swap contracts entered during the year | 3 | |||||||||||
| Derivative term of contract | 5 years | 6 years | 4 years | |||||||||
| Derivative fixed interest rate | 2.00% | 2.30% | 1.50% | |||||||||
| Derivative weighted average fixed interest rate | 2.10% | |||||||||||
| Weighted average remaining life of contracts | 4 years 6 months | |||||||||||
| Interest rate swap contracts included in Accounts Payable | 0.5 | 1.3 | ||||||||||
| Unrealised gain on interest rate swap contracts | 0.8 | 1.8 | ||||||||||
| Realised loss on settlements of interest rate swap contracts | 0.6 | 2.1 | ||||||||||
| Derivative forward start date | Oct. 31, 2014 | Jul. 31, 2014 | Jul. 31, 2014 | |||||||||
| Estimated fair value associated with foreign currency forward contracts | 0.5 | |||||||||||
| Cumulative unrealised gains arising from changes in the fair value of foreign currency forward contracts designated as a cash flow hedging arrangement | 0.9 | |||||||||||
| Maximum term of forecasted transaction | 1 year 1 month 6 days | 1 year 1 month 6 days | ||||||||||
| Amounts reclassified from accumulated other comprehensive income | 0 | |||||||||||
| Fair value of derivative assets | $ 2.3 | $ 1.8 | ||||||||||