|
Selected Quarterly Financial Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jan. 31, 2014
|
Oct. 31, 2013
|
Jul. 31, 2013
|
Apr. 30, 2013
|
Jan. 31, 2013
|
Oct. 31, 2012
|
Jul. 31, 2012
|
Apr. 30, 2012
|
Jan. 31, 2014
|
Jan. 31, 2013
|
Jan. 31, 2012
|
|
| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Net revenue | $ 586.6 | $ 555.2 | $ 561.7 | $ 570.4 | $ 606.9 | $ 548.0 | $ 568.7 | $ 588.6 | $ 2,273.9 | $ 2,312.2 | $ 2,215.6 |
| Gross profit | 514.7 | 488.1 | 493.9 | 502.9 | 544.9 | 490.1 | 508.9 | 529.8 | 1,999.6 | 2,073.7 | 1,986.5 |
| Income from operations | 51.7 | 68.1 | 83.6 | 81.4 | 84.6 | 34.4 | 92.9 | 94.0 | 284.8 | 305.9 | 355.6 |
| Provision for income taxes | (2.4) | (11.6) | (20.1) | (17.0) | (11.6) | (4.9) | (27.5) | (18.6) | (51.1) | (62.6) | (77.6) |
| Net income | 53.9 | 57.6 | 61.7 | 55.6 | 74.5 | 29.4 | 64.6 | 78.9 | 228.8 | 247.4 | 285.3 |
| Basic net income per share | $ 0.24 | $ 0.26 | $ 0.28 | $ 0.25 | $ 0.33 | $ 0.13 | $ 0.28 | $ 0.35 | $ 1.02 | $ 1.09 | $ 1.25 |
| Diluted net income per share | $ 0.23 | $ 0.25 | $ 0.27 | $ 0.24 | $ 0.32 | $ 0.13 | $ 0.28 | $ 0.34 | $ 1.00 | $ 1.07 | $ 1.22 |
| Income from operations includes following items [Abstract] | |||||||||||
| Stock-based compensation expense | 36.1 | 31.6 | 31.0 | 33.5 | 37.5 | 51.9 | 33.5 | 33.4 | 132.2 | 156.3 | 108.8 |
| Amortization of acquisition related intangibles | 20.6 | 18.2 | 20.3 | 21.6 | 23.0 | 23.7 | 17.5 | 17.6 | 80.7 | 81.8 | |
| Additions | $ 6.3 | $ 4.4 | $ 1.7 | $ 0.4 | $ 7.2 | $ 36.7 | $ 0 | $ 0 | $ 12.8 | $ 43.9 | $ (1.3) |