|
Summary of Marketable Securities (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
Apr. 30, 2013
|
Apr. 30, 2012
|
|---|---|---|
| Schedule Of Marketable Securities [Line Items] | ||
| Obligations for which assets are held in trust | $ 99.2 | $ 82.6 |
| Cash equivalents | 93.6 | 60.5 |
| Restricted cash | $ 2.9 | $ 10.0 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements other than those specified elsewhere in the taxonomy. No definition available.
|
| X | ||||||||||
|
- Definition
The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. No definition available.
|