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Financial Instruments (Tables) | 12 Months Ended
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Jan. 31, 2018
Investments, All Other Investments [Abstract] |
Cost and Fair Value of Financial Instruments Disclosure | The following tables summarize the Company's financial instruments' amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category as of January 31, 2018 and 2017.
|  |  | January 31, 2018
|  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents (1): |  |  |  |  |  |  |  |  |  |  |  |  |
| Agency bonds | $ | 5.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | 5.0 |  |  | $ | — |  |  | $ | — |
| Certificates of deposit | 17.4 |  |  | — |  |  | — |  |  | 17.4 |  |  | 17.4 |  |  | — |  |  | — |
| Commercial paper | 324.2 |  |  | — |  |  | — |  |  | 324.2 |  |  | — |  |  | 324.2 |  |  | — |
| Corporate debt securities | 5.0 |  |  | — |  |  | — |  |  | 5.0 |  |  | 5.0 |  |  | — |  |  | — |
| Custody cash deposit | 5.2 |  |  | — |  |  | — |  |  | 5.2 |  |  | 5.2 |  |  | — |  |  | — |
| Money market funds | 278.8 |  |  | — |  |  | — |  |  | 278.8 |  |  | — |  |  | 278.8 |  |  | — |
| Municipal bonds | 5.0 |  |  | — |  |  | — |  |  | 5.0 |  |  | 5.0 |  |  | — |  |  | — |
| Sovereign debt | 2.0 |  |  | — |  |  | — |  |  | 2.0 |  |  | — |  |  | 2.0 |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
| Short-term available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Asset backed securities | 13.1 |  |  | — |  |  | — |  |  | 13.1 |  |  | — |  |  | 13.1 |  |  | — |
|  | Commercial paper | 27.5 |  |  | — |  |  | — |  |  | 27.5 |  |  | — |  |  | 27.5 |  |  | — |
|  | Corporate debt securities | 99.4 |  |  | — |  |  | (0.1 | ) |  | 99.3 |  |  | 99.3 |  |  | — |  |  | — |
|  | Other (2) | 9.2 |  |  | — |  |  | — |  |  | 9.2 |  |  | 7.7 |  |  | 1.5 |  |  | — |
|  | U.S. government securities | 37.1 |  |  | — |  |  | — |  |  | 37.1 |  |  | 37.1 |  |  | — |  |  | — |
| Short-term trading securities |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Mutual funds | 50.1 |  |  | 8.9 |  |  | — |  |  | 59.0 |  |  | 59.0 |  |  | — |  |  | — |
| Long-term available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Agency bonds | 13.7 |  |  | — |  |  | (0.1 | ) |  | 13.6 |  |  | 13.6 |  |  | — |  |  | — |
|  | Asset backed securities | 36.8 |  |  | — |  |  | (0.2 | ) |  | 36.6 |  |  | — |  |  | 36.6 |  |  | — |
|  | Corporate debt securities | 100.2 |  |  | 0.1 |  |  | (0.4 | ) |  | 99.9 |  |  | 99.9 |  |  | — |  |  | — |
|  | Municipal bonds | 12.7 |  |  | — |  |  | (0.1 | ) |  | 12.6 |  |  | 12.6 |  |  | — |  |  | — |
|  | Sovereign debt | 2.8 |  |  | — |  |  | — |  |  | 2.8 |  |  | — |  |  | 2.8 |  |  | — |
|  | U.S. government securities | 25.5 |  |  | — |  |  | (0.2 | ) |  | 25.3 |  |  | 25.3 |  |  | — |  |  | — |
Convertible debt securities (3) | 7.5 |  |  | 0.5 |  |  | (0.2 | ) |  | 7.8 |  |  | — |  |  | — |  |  | 7.8 |
Derivative contract assets (4) | 2.0 |  |  | 7.5 |  |  | (1.3 | ) |  | 8.2 |  |  | — |  |  | 7.2 |  |  | 1.0 |
Derivative contract liabilities (5) | — |  |  | — |  |  | (26.6 | ) |  | (26.6 | ) |  | — |  |  | (26.6 | ) |  | — |
|  | Total | $ | 1,080.2 |  |  | $ | 17.0 |  |  | $ | (29.2 | ) |  | $ | 1,068.0 |  |  | $ | 392.1 |  |  | $ | 667.1 |  |  | $ | 8.8 |
____________________
(1) | Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.
(2) | Consists of agency bonds, certificates of deposit, sovereign debt, and municipal bonds.
(3) | Considered “available for sale” and included in “Other assets” in the accompanying Consolidated Balance Sheets.
(4) | Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
(5) | Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
|  |  | January 31, 2017
|  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Cash equivalents (1): |  |  |  |  |  |  |  |  |  |  |  |  |
| Agency bonds | $ | 6.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.0 |  |  | $ | 6.0 |  |  | $ | — |  |  | $ | — |
| Certificates of deposit | 63.1 |  |  | — |  |  | — |  |  | 63.1 |  |  | 63.1 |  |  | — |  |  | — |
| Commercial paper | 207.4 |  |  | — |  |  | — |  |  | 207.4 |  |  | — |  |  | 207.4 |  |  | — |
| Corporate debt securities | 40.2 |  |  | — |  |  | — |  |  | 40.2 |  |  | 40.2 |  |  | — |  |  | — |
| Custody cash deposit | 3.2 |  |  | — |  |  | — |  |  | 3.2 |  |  | 3.2 |  |  | — |  |  | — |
| Money market funds | 256.5 |  |  | — |  |  | — |  |  | 256.5 |  |  | — |  |  | 256.5 |  |  | — |
| Municipal bonds | 5.0 |  |  | — |  |  | — |  |  | 5.0 |  |  | 5.0 |  |  | — |  |  | — |
| Sovereign debt | 15.0 |  |  | — |  |  | — |  |  | 15.0 |  |  | — |  |  | 15.0 |  |  | — |
| U.S. government securities | 309.5 |  |  | — |  |  | — |  |  | 309.5 |  |  | 309.5 |  |  | — |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
| Short-term available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Agency bonds | 13.2 |  |  | — |  |  |  |  | 13.2 |  |  | 13.2 |  |  | — |  |  | — |
|  | Asset backed securities | 19.6 |  |  | — |  |  | — |  |  | 19.6 |  |  | — |  |  | 19.6 |  |  | — |
|  | Certificates of deposit | 157.3 |  |  | — |  |  | — |  |  | 157.3 |  |  | 157.3 |  |  | — |  |  | — |
|  | Commercial paper | 109.2 |  |  | — |  |  | — |  |  | 109.2 |  |  | — |  |  | 109.2 |  |  | — |
|  | Corporate debt securities | 234.7 |  |  | — |  |  | (0.2 | ) |  | 234.5 |  |  | 234.5 |  |  | — |  |  | — |
|  | Municipal bonds | 43.4 |  |  | — |  |  | — |  |  | 43.4 |  |  | 43.4 |  |  | — |  |  | — |
|  | Sovereign debt | 30.0 |  |  | — |  |  | — |  |  | 30.0 |  |  | — |  |  | 30.0 |  |  | — |
|  | U.S. government securities | 32.3 |  |  | — |  |  | — |  |  | 32.3 |  |  | 32.3 |  |  | — |  |  | — |
| Short-term trading securities |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Mutual funds | 44.8 |  |  | 2.5 |  |  | — |  |  | 47.3 |  |  | 47.3 |  |  | — |  |  | — |
| Long-term available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Agency bonds | 7.1 |  |  | — |  |  | — |  |  | 7.1 |  |  | 7.1 |  |  | — |  |  | — |
|  | Asset backed securities | 65.8 |  |  | 0.1 |  |  | — |  |  | 65.9 |  |  | — |  |  | 65.9 |  |  | — |
|  | Corporate debt securities | 172.1 |  |  | 0.1 |  |  | (0.1 | ) |  | 172.1 |  |  | 172.1 |  |  | — |  |  | — |
|  | Municipal bonds | 10.7 |  |  | — |  |  | — |  |  | 10.7 |  |  | 10.7 |  |  | — |  |  | — |
|  | Sovereign debt | 1.5 |  |  | — |  |  | — |  |  | 1.5 |  |  | — |  |  | 1.5 |  |  | — |
|  | U.S. government securities | 48.8 |  |  | 0.1 |  |  | — |  |  | 48.9 |  |  | 48.9 |  |  | — |  |  | — |
Convertible debt securities (2) | 4.9 |  |  | 2.3 |  |  | (1.6 | ) |  | 5.6 |  |  | — |  |  | — |  |  | 5.6 |
Derivative contract assets (3) | 2.2 |  |  | 12.3 |  |  | (1.3 | ) |  | 13.2 |  |  | — |  |  | 11.9 |  |  | 1.3 |
Derivative contract liabilities (4) | — |  |  | — |  |  | (10.4 | ) |  | (10.4 | ) |  | — |  |  | (10.4 | ) |  | — |
|  | Total | $ | 1,903.5 |  |  | $ | 17.4 |  |  | $ | (13.6 | ) |  | $ | 1,907.3 |  |  | $ | 1,193.8 |  |  | $ | 706.6 |  |  | $ | 6.9 |
____________________
(1) | Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.
(2) | Considered "available for sale" securities and included in "Other assets" in the accompanying Consolidated Balance Sheets.
(3) | Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
(4) Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | A reconciliation of the change in Autodesk’s Level 3 items for the fiscal year ended January 31, 2018 was as follows:
| Fair Value Measurements Using Significant Unobservable Inputs
| (Level 3)
|  | Derivative Contracts |  | Convertible Debt Securities |  | Total
Balances, January 31, 2017 |  | $ | 1.3 |  |  | $ | 5.6 |  |  | $ | 6.9 |
Purchases |  | 1.1 |  |  | 5.9 |  |  | 7.0 |
Gains (losses) included in earnings (1) |  | (1.4 | ) |  | (3.2 | ) |  | (4.6 | )
Gains included in OCI |  | — |  |  | (0.5 | ) |  | (0.5 | )
Balances, January 31, 2018 |  | $ | 1.0 |  |  | $ | 7.8 |  |  | $ | 8.8 |
____________________
(1) | Included in “Interest and other expense, net” in the accompanying Consolidated Statement of Operations.
Available-for-sale Securities | The following table summarizes the estimated fair value of Autodesk's “available-for-sale securities” classified by the contractual maturity date of the security:
| January 31, 2018
| Cost |  | Fair Value
Due within in 1 year | $ | 193.8 |  |  | $ | 194.0 |
Due in 1 year through 5 years | 186.9 |  |  | 186.0 |
Due in 5 years through 10 years | 3.7 |  |  | 3.7 |
Due after 10 years | 1.1 |  |  | 1.1 |
Total | $ | 385.5 |  |  | $ | 384.8 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The fair value of derivative instruments in Autodesk’s Consolidated Balance Sheets were as follows as of January 31, 2018, and January 31, 2017:
| Balance Sheet Location |  | Fair Value at
| January 31, 2018 |  | January 31, 2017
Derivative Assets |  |  |  |  |
Foreign currency contracts designated as cash flow hedges | Prepaid expenses and other current assets |  | $ | 6.2 |  |  | $ | 10.1 |
Derivatives not designated as hedging instruments | Prepaid expenses and other current assets and Other assets |  | 2.0 |  |  | 3.2 |
Total derivative assets |  |  | $ | 8.2 |  |  | $ | 13.3 |
Derivative Liabilities |  |  |  |  |
Foreign currency contracts designated as cash flow hedges | Other accrued liabilities |  | $ | 18.7 |  |  | $ | 4.5 |
Derivatives not designated as hedging instruments | Other accrued liabilities |  | 7.9 |  |  | 6.0 |
Total derivative liabilities |  |  | $ | 26.6 |  |  | $ | 10.5 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance | The effects of derivatives designated as hedging instruments on Autodesk’s Consolidated Statements of Operations were as follows for the fiscal years ended January 31, 2018, 2017, and 2016, respectively (amounts presented include any income tax effects):
| Foreign Currency Contracts
| Fiscal Year Ended January 31,
| 2018 |  | 2017 |  | 2016
Amount of (loss) gain recognized in accumulated other comprehensive loss on derivatives (effective portion) | $ | (21.3 | ) |  | $ | 6.3 |  |  | $ | 2.2 |
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion) |  |  |  |  |
Net revenue | $ | 8.0 |  |  | $ | 9.2 |  |  | $ | 39.8 |
Operating expenses | 1.9 |  |  | (1.8 | ) |  | (10.5 | )
Total | $ | 9.9 |  |  | $ | 7.4 |  |  | $ | 29.3 |
Amount and location of loss recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing) |  |  |  |  |
Interest and other expense, net | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | (0.7 | )
The effects of derivatives not designated as hedging instruments on Autodesk’s Consolidated Statements of Operations were as follows for the fiscal years ended January 31, 2018, 2017, and 2016, respectively (amounts presented include any income tax effects):
| Fiscal Year Ended January 31,
| 2018 |  | 2017 |  | 2016
Amount and location of loss recognized in loss (income) on derivatives |  |  |  |  |
Interest and other expense, net | $ | (19.1 | ) |  | $ | (11.1 | ) |  | $ | (1.7 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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