Shareholders' Equity (Details) $ in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
|
Jul. 31, 2021
USD ($)
shares
|
Jul. 31, 2021
USD ($)
shares
|
|
| Equity [Abstract] | ||
| Repurchase of stock (in shares) | shares | 7,006,326 | 9,156,898 |
| Repurchase of stock | $ 700.0 | $ 950.0 |
| Repurchase of stock, shares not settled (in shares) | 2.5 | 2.5 |
| Remaining repurchase authorization | $ 1,450.0 | $ 1,450.0 |
| X | ||||||||||
- Definition Stock Repurchased During Period, Value, Not Settled No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount remaining of a stock repurchase plan authorized. No definition available.
|
| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|