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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Oct. 31, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jan. 31, 2016
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | $ 1,025.2 | $ 1,213.1 | $ 1,436.5 | $ 1,353.0
Derivative contract assets, Amortized Cost | 2.4 | 2.2 |  |
Derivative contract assets, Gross unrealized gains | 7.2 | 12.3 |  |
Derivative contract assets, Gross unrealized losses | (0.5) | (1.3) |  |
Derivative contract assets | 9.1 | 13.2 |  |
Derivative contract liabilities, Amortized Cost | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized gains | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized losses | (8.9) | (10.4) |  |
Derivative contract liabilities | (8.9) | (10.4) |  |
Amortized Cost | 1,329.9 | 1,903.5 |  |
Gross unrealized gains | 15.5 | 17.4 |  |
Gross unrealized losses | (9.9) | (13.6) |  |
Fair Value | 1,335.5 | 1,907.3 |  |
Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Amortized Cost | 49.1 | 44.8 |  |
Mutual funds, Gross unrealized gains | 7.4 | 2.5 |  |
Mutual funds, Gross unrealized losses | 0.0 | 0.0 |  |
Mutual funds, Fair Value | 56.5 | 47.3 |  |
Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 7.5 | 13.2 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 |  |  |
Marketable securities, Fair Value | 7.5 | 13.2 |  |
Marketable Securities, Current | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 30.4 | 19.6 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 30.4 | 19.6 |  |
Marketable Securities, Current | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 4.0 | 157.3 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 4.0 | 157.3 |  |
Marketable Securities, Current | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 31.3 | 109.2 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 31.3 | 109.2 |  |
Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 218.7 | 234.7 |  |
Marketable securities, Gross unrealized gains | 0.1 | 0.0 |  |
Marketable securities, Gross unrealized losses | (0.1) | (0.2) |  |
Marketable securities, Fair Value | 218.7 | 234.5 |  |
Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 15.5 | 43.4 |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 15.5 | 43.4 |  |
Marketable Securities, Current | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 6.0 | 30.0 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 6.0 | 30.0 |  |
Marketable Securities, Current | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 58.8 | 32.3 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 58.8 | 32.3 |  |
Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 12.2 | 7.1 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 12.2 | 7.1 |  |
Marketable Securities, Noncurrent | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 60.8 | 65.8 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.1 |  |
Marketable securities, Gross unrealized losses | (0.1) | 0.0 |  |
Marketable securities, Fair Value | 60.7 | 65.9 |  |
Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 143.1 | 172.1 |  |
Marketable securities, Gross unrealized gains | 0.2 | 0.1 |  |
Marketable securities, Gross unrealized losses | (0.1) | (0.1) |  |
Marketable securities, Fair Value | 143.2 | 172.1 |  |
Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 12.8 | 10.7 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | (0.1) | 0.0 |  |
Marketable securities, Fair Value | 12.7 | 10.7 |  |
Marketable Securities, Noncurrent | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 2.7 | 1.5 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 2.7 | 1.5 |  |
Marketable Securities, Noncurrent | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 32.9 | 48.8 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.1 |  |
Marketable securities, Gross unrealized losses | (0.1) | 0.0 |  |
Marketable securities, Fair Value | 32.8 | 48.9 |  |
Other asset |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Amortized Cost |  | 4.9 |  |
Convertible debt securities, Gross unrealized gains |  | 2.3 |  |
Convertible debt securities, Gross unrealized losses |  | (1.6) |  |
Convertible debt securities, Fair Value |  | 5.6 |  |
Other asset | Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Amortized Cost | 8.4 |  |  |
Convertible debt securities, Gross unrealized gains | 0.6 |  |  |
Convertible debt securities, Gross unrealized losses | 0.0 |  |  |
Convertible debt securities, Fair Value | 9.0 |  |  |
Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents |  | 6.0 |  |
Cash equivalents, Fair Value |  | 6.0 |  |
Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 63.1 | 63.1 |  |
Cash equivalents, Fair Value | 63.1 | 63.1 |  |
Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 8.0 | 40.2 |  |
Cash equivalents, Fair Value | 8.0 | 40.2 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 166.5 | 207.4 |  |
Cash equivalents, Fair Value | 166.5 | 207.4 |  |
Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 0.9 | 3.2 |  |
Cash equivalents, Fair Value | 0.9 | 3.2 |  |
Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents |  | 5.0 |  |
Cash equivalents, Fair Value |  | 5.0 |  |
Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 144.8 | 256.5 |  |
Cash equivalents, Fair Value | 144.8 | 256.5 |  |
Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents |  | 15.0 |  |
Cash equivalents, Fair Value |  | 15.0 |  |
U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 250.0 | 309.5 |  |
Cash equivalents, Fair Value | 250.0 | 309.5 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 0.0 | 0.0 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 883.9 | 1,193.8 |  |
Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Fair Value | 56.5 | 47.3 |  |
Level 1 | Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 7.5 | 13.2 |  |
Level 1 | Marketable Securities, Current | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Marketable Securities, Current | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 4.0 | 157.3 |  |
Level 1 | Marketable Securities, Current | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 218.7 | 234.5 |  |
Level 1 | Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 15.5 | 43.4 |  |
Level 1 | Marketable Securities, Current | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Marketable Securities, Current | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 58.8 | 32.3 |  |
Level 1 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 12.2 | 7.1 |  |
Level 1 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 143.2 | 172.1 |  |
Level 1 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 12.7 | 10.7 |  |
Level 1 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 32.8 | 48.9 |  |
Level 1 | Other asset |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value |  | 0.0 |  |
Level 1 | Other asset | Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value | 0.0 |  |  |
Level 1 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 6.0 |  |
Level 1 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 63.1 | 63.1 |  |
Level 1 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 8.0 | 40.2 |  |
Level 1 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 1 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.9 | 3.2 |  |
Level 1 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 5.0 |  |
Level 1 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 1 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 1 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 250.0 | 309.5 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 7.1 | 11.9 |  |
Derivative contract liabilities | (8.9) | (10.4) |  |
Fair Value | 440.6 | 706.6 |  |
Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Current | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 30.4 | 19.6 |  |
Level 2 | Marketable Securities, Current | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Current | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 31.3 | 109.2 |  |
Level 2 | Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Current | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 6.0 | 30.0 |  |
Level 2 | Marketable Securities, Current | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 60.7 | 65.9 |  |
Level 2 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 2.7 | 1.5 |  |
Level 2 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 2 | Other asset |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value |  | 0.0 |  |
Level 2 | Other asset | Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value | 0.0 |  |  |
Level 2 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 2 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 166.5 | 207.4 |  |
Level 2 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 2 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 144.8 | 256.5 |  |
Level 2 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 15.0 |  |
Level 2 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 2.0 | 1.3 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 11.0 | 6.9 |  |
Level 3 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Current | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 0.0 |  |
Level 3 | Other asset |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value |  | 5.6 |  |
Level 3 | Other asset | Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value | 9.0 |  |  |
Level 3 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 3 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 3 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value |  | 0.0 |  |
Level 3 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | $ 0.0 | $ 0.0 |  |

X
- Definition Amortized Cost Securities + References No definition available. + Details
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X
- Definition Convertible Debt Securities, Amortized Cost + References No definition available. + Details
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Namespace Prefix: | adsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Convertible Debt Securities, Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | adsk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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