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Derivatives - Additional Information (Detail) (USD $)
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0 Months Ended |
9 Months Ended |
12 Months Ended |
3 Months Ended |
9 Months Ended |
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Sep. 30, 2013
Contract
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Mar. 31, 2015
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Jun. 30, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2014
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| Derivative [Line Items] |
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| Fair Value Assets/(Liability) Net |
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$ 263,274,000 |
$ (21,283,000) |
$ 263,274,000 |
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| Number of interest rate swap contracts |
1 |
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| Not Designated as Hedging Instrument [Member] |
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| Derivative [Line Items] |
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| Forward contracts, maturity period |
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October 2017 |
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| Forward contracts maturing within 12 months |
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353,200,000 |
363,400,000 |
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| Interest Rate Swap Contract [Member] |
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| Derivative [Line Items] |
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| Notional amount of interest rate derivatives |
19,700,000 |
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| Cash Flow Hedging [Member] |
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| Derivative [Line Items] |
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| Fair value of forward contracts |
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1,526,900,000 |
1,467,700,000 |
1,526,900,000 |
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| Forward contracts, maturity period |
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June 2018 |
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| Ineffectiveness recognized |
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2,200,000 |
|
200,000 |
700,000 |
1,900,000 |
| Amount expected to be reclassified from AOCI to earnings within the next 12 months |
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108,400,000 |
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| Recognized net gains related to the change in forward points |
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0 |
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0 |
600,000 |
600,000 |
| Cash Flow Hedging [Member] | Hedging Instruments [Member] | Designated as Hedging Instrument [Member] |
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| Derivative [Line Items] |
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| Fair Value Assets/(Liability) Net |
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259,613,000 |
(19,856,000) |
259,613,000 |
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| Economic Hedges, Gross [Member] | Designated as Hedging Instrument [Member] |
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| Derivative [Line Items] |
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| Fair Value Assets/(Liability) Net |
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$ 3,661,000 |
$ (1,427,000) |
$ 3,661,000 |
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| Minimum [Member] |
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| Derivative [Line Items] |
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| Foreign exchange contracts maturity period, years |
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2 years |
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| Maximum [Member] |
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| Derivative [Line Items] |
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| Foreign exchange contracts maturity period, years |
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5 years |
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