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Summary of Marketable Securities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012 | Jan. 31, 2013 Investments Held in Trust | Jan. 31, 2012 Investments Held in Trust
Schedule Of Marketable Securities [Line Items] |  |  |  |
Obligations for which assets are held in trust | $ 96.5 | $ 82.6 |  |
Increase (decrease) in fair value of trading securities |  |  | 4.6 | (2.3)
Company contribution | 20.0 |  |  |
Employee contribution | 1.9 |  |  |
Distributions | 12.9 |  |  |
Cash equivalents | 58.5 | 60.5 |  |
Restricted cash | $ 2.9 | $ 10.0 |  |

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