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Summary of Marketable Securities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2012 | Apr. 30, 2012 | Oct. 31, 2012 Investments Held in Trust | Oct. 31, 2011 Investments Held in Trust
Schedule Of Marketable Securities [Line Items] |  |  |  |
Obligations for which assets are held in trust | $ 93.9 | $ 82.6 |  |
Increase (decrease) in fair value of trading securities |  |  | 1.1 | (4.1)
Company contribution | 19.3 |  |  |
Employee contribution | 1.7 |  |  |
Distributions | 10.4 |  |  |
Cash equivalents | 74.1 | 60.5 |  |
Restricted cash | $ 10.1 | $ 10.1 |  |

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