|
Financial Instruments - Contractual Maturities of Types of Securities (Details) (USD $)
In Millions, unless otherwise specified |
Jan. 31, 2014
|
|---|---|
| Cost | |
| Due in 1 year | $ 375.2 |
| Due in 1 year through 5 years | 297.7 |
| Due in 5 years through 10 years | 0 |
| Due after 10 years | 0 |
| Total | 672.9 |
| Fair Value | |
| Due in 1 year | 375.2 |
| Due in 1 year through 5 years | 297.5 |
| Due in 5 years through 10 years | 0 |
| Due after 10 years | 0 |
| Total | $ 672.7 |