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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 553.8 | $ 515.3 | $ 501.8 | $ 485.7 | $ 478.8 | $ 489.6 | $ 550.7 | $ 511.9 | $ 2,056.6 | $ 2,031.0 | $ 2,504.1
Gross profit | 480.7 | 437.8 | 427.2 | 407.5 | 395.9 | 408.1 | 465.6 | 419.5 | 1,753.2 | 1,689.1 | 2,133.4
Loss from operations | (181.9) | (100.0) | (107.6) | (119.6) | (167.1) | (119.9) | (62.9) | (149.7) | (509.1) | (499.6) | 1.3
Provision for income taxes | 24.8 | (8.6) | (17.6) | (8.2) | (5.2) | (13.5) | (25.2) | (14.4) | (9.6) | (58.3) | (310.2)
Net loss | $ (173.5) | $ (119.8) | $ (144.0) | $ (129.6) | $ (173.4) | $ (142.8) | $ (98.2) | $ (167.7) | $ (566.9) | $ (582.1) | $ (330.5)
Basic net loss per share (usd per share) | $ (0.79) | $ (0.55) | $ (0.66) | $ (0.59) | $ (0.78) | $ (0.64) | $ (0.44) | $ (0.75) | $ (2.58) | $ (2.61) | $ (1.46)
Diluted net loss per share (usd per share) | $ (0.79) | $ (0.55) | $ (0.66) | $ (0.59) | $ (0.78) | $ (0.64) | $ (0.44) | $ (0.75) | $ (2.58) | $ (2.61) | $ (1.46)
Loss from operations includes the following items: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 62.1 | $ 65.1 | $ 58.8 | $ 59.0 | $ 59.3 | $ 56.6 | $ 54.3 | $ 51.6 | $ 245.0 | $ 221.8 |
Amortization of acquisition related intangibles | 8.6 | 8.7 | 8.9 | 10.4 | 17.3 | 17.2 | 18.5 | 18.8 | 36.6 | 71.8 |
CEO transition costs | (0.2) | 0.0 | 10.6 | 11.0 |  |  |  |  | 21.4 |  |
Restructuring charges and other facility exit costs, net | $ 93.9 | $ 0.0 | $ 0.5 | $ (0.3) | $ 9.0 | $ 3.2 | $ 16.0 | $ 52.3 | $ 94.1 | $ 80.5 | $ 0.0

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