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Income Taxes (Tables)
 12 Months Ended
Jan. 31, 2018
Income Tax Disclosure [Abstract]  
Provision for income taxes The provision for income taxes consists of the following:
 
Fiscal year ended January 31,
2018
 
2017
 
2016
Federal:
 
 
 
 
 
Current
$
(0.8
)
 
$
1.6

 
$
(4.7
)
Deferred
(19.3
)
 
8.4

 
220.9

State:
 
 
 
 
 
Current
(0.3
)
 
(1.9
)
 
0.5

Deferred
2.2

 
1.3

 
20.9

Foreign:
 
 
 
 
 
Current
50.9

 
93.9

 
68.4

Deferred
(23.1
)
 
(45.0
)
 
4.2

 
$
9.6

 
$
58.3

 
$
310.2
Differences between the U.S. statutory rate and the aggregate income tax provision The differences between the U.S. statutory rate and the aggregate income tax provision are as follows:
 
Fiscal year ended January 31,
2018
 
2017
 
2016
Income tax provision (benefit) at U.S. Federal statutory rate
$
(188.4
)
 
$
(177.0
)
 
$
(7.1
)
State income tax benefit, net of the U.S. Federal benefit
(21.9
)
 
(17.3
)
 
(7.6
)
Foreign income taxed at rates different from the U.S. statutory rate
(53.3
)
 
22.3

 
(29.4
)
U.S. valuation allowance
(82.5
)
 
233.0

 
345.0

Transition tax
408.4

 
—

 
—

Increase in attributes due to ASU 2016-9 adoption


 
(119.4
)
 
—

Change in valuation allowance from ASU 2016-9 adoption
—

 
119.4

 
—

Tax effect of non-deductible stock-based compensation
20.7

 
18.8

 
19.3

Stock compensation windfall / shortfall
(67.7
)
 
(23.0
)
 
—

Research and development tax credit benefit
(11.3
)
 
(10.3
)
 
(9.4
)
Closure of income tax audits and changes in uncertain tax positions
1.2

 
8.2

 
(4.7
)
Tax effect of officer compensation in excess of $1.0 million
2.2

 
2.2

 
1.4

Non-deductible expenses
2.1

 
2.0

 
2.6

Other
0.1

 
(0.6
)
 
0.1

 
$
9.6

 
$
58.3

 
$
310.2
Components of Deferred Tax Assets and Liabilities Significant components of Autodesk’s deferred tax assets and liabilities are as follows:
 
January 31,
2018
 
2017
Stock-based compensation
$
26.7

 
$
37.6

Research and development tax credit carryforwards
170.3

 
136.7

Foreign tax credit carryforwards
162.2

 
127.3

Accrued compensation and benefits
25.9

 
39.5

Other accruals not currently deductible for tax
22.9

 
18.7

Purchased technology and capitalized software
43.4

 
76.9

Fixed assets
16.5

 
24.3

Tax loss carryforwards
85.7

 
173.6

Deferred revenue
120.3

 
128.3

Other
32.4

 
27.6

Total deferred tax assets
706.3

 
790.5

Less: valuation allowance
(634.2
)
 
(748.0
)
Net deferred tax assets
72.1

 
42.5

Indefinite lived intangibles
(57.0
)
 
(70.1
)
Total deferred tax liabilities
(57.0
)
 
(70.1
)
Net deferred tax assets
$
15.1

 
$
(27.6
)
Unrecognized Tax Benefits Reconciliation, Table A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows:
 
Fiscal Year Ended January 31,
 
2018
 
2017
 
2016
Gross unrecognized tax benefits at the beginning of the fiscal year
$
261.4

 
$
254.3

 
$
245.8

Increases for tax positions of prior years
22.8

 
11.9

 
1.4

Decreases for tax positions of prior years
(22.5
)
 
(4.1
)
 
(7.0
)
Increases for tax positions related to the current year
78.4

 
11.1

 
15.8

Decreases relating to settlements with taxing authorities
(0.8
)
 
(10.8
)
 
(0.5
)
Reductions as a result of lapse of the statute of limitations
(1.7
)
 
(1.0
)
 
(1.2
)
Gross unrecognized tax benefits at the end of the fiscal year
$
337.6

 
$
261.4

 
$
254.3