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Note 17 - Income Taxes (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
   
Years ended August 31,
 
(in thousands)
 
2018
   
2017
   
2016
 
U.S. operations
  $
199,654
    $
218,650
    $
353,434
 
Non-U.S. operations
   
152,184
     
125,662
     
107,559
 
Income before income taxes
  $
351,838
    $
344,312
    $
460,993
 
                         
U.S. operations
  $
65,778
    $
65,403
    $
106,671
 
Non-U.S. operations
   
18,975
     
20,650
     
15,507
 
Total provision for income taxes
  $
84,753
    $
86,053
    $
122,178
 
Effective tax rate
   
24.1
%    
25.0
%    
26.5
%
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Years ended August 31,
 
(in thousands)
 
2018
   
2017
   
2016
 
Current
                       
U.S. federal
  $
58,835
    $
58,057
    $
97,703
 
U.S. state and local
   
5,159
     
5,659
     
4,917
 
Non-U.S.
   
22,669
     
17,458
     
15,030
 
Total current taxes
  $
86,663
    $
81,174
    $
117,650
 
                         
Deferred
                       
U.S. federal
  $
2,079
    $
4,320
    $
3,915
 
U.S. state and local
   
(295
)    
(77
)    
136
 
Non-U.S.
   
(3,694
)    
636
     
477
 
Total deferred taxes
  $
(1,910
)   $
4,879
    $
4,528
 
Total provision for income taxes
  $
84,753
    $
86,053
    $
122,178
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Years ended August 31,
   
(expressed as a percentage of income before income taxes)
 
2018
   
2017
     
2016
   
Tax at U.S. Federal statutory tax rate
   
25.7
%
   
35.0
%
 
   
35.0
%
 
Increase (decrease) in taxes resulting from:
                           
State and local taxes, net of U.S. federal income tax benefit
   
2.9
     
1.8
 
 
   
1.5
 
 
Foreign income at other than U.S. rates
   
(3.2
)
   
(7.0
)
(3)
 
   
(5.0
)
(4)
 
Domestic production activities deduction
   
(1.6
)
   
(2.1
)
 
   
(1.5
)
 
Income tax benefits from R&D tax credits
   
(3.7
)
   
(3.3
)
 
   
(3.6
)
 
Income tax benefits from foreign tax credits
   
     
(0.3
)
 
   
(0.2
)
 
Share-Based Payments
(
1
)
   
(2.7
)
   
 
 
   
 
 
One-time transition tax from TCJA
(
2
)
   
6.6
     
 
 
   
 
 
Other, net
   
0.1
     
0.9
 
 
   
0.3
 
 
Effective tax rate
   
24.1
%
   
25.0
%
 
   
26.5
%
(5)
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
At August 31,
 
(in thousands)
 
2018
   
2017
 
Deferred tax assets:
               
Receivable reserve
  $
599
    $
811
 
Depreciation on property, equipment and leasehold improvements
   
1,032
     
2,220
 
Deferred rent
   
7,711
     
11,615
 
Stock-based compensation
   
14,827
     
20,117
 
Purchased intangible assets, including acquired technology
   
(24,059
)
   
(32,742
)
Other
   
9,606
     
8,059
 
Total deferred tax assets
  $
9,716
    $
10,080
 
   
At August 31,
 
(in thousands)
 
2018
   
2017
 
Deferred tax liabilities:
               
Stock-based compensation
  $
(946
)   $
(815
)
Purchased intangible assets, including acquired technology
   
22,429
     
26,231
 
Other
   
(293
)    
1,858
 
Total deferred tax liabilities
  $
21,190
    $
27,274
 
Summary of Income Tax Contingencies [Table Text Block]
(in thousands)
 
 
 
 
Unrecognized income tax benefits at August 31, 2015
  $
6,776
 
Additions based on tax positions related to the current year
   
1,779
 
Additions for tax positions of prior years
   
1,436
 
Statute of limitations lapse
   
(1,209
)
Unrecognized income tax benefits at August 31, 2016
  $
8,782
 
Additions based on tax positions related to the current year
   
3,896
 
Additions for tax positions of prior years
   
628
 
Statute of limitations lapse
   
(1,822
)
Unrecognized income tax benefits at August 31, 2017
  $
11,484
 
Additions based on tax positions related to the current year
   
2,954
 
Additions for tax positions of prior years
   
531
 
Statute of limitations lapse
   
(3,146
)
Reductions from settlements with Taxing Authorities
   
(2,600
)
Unrecognized income tax benefits at August 31, 2018
  $
9,223
 
Summary of Income Tax Examinations [Table Text Block]
Major Tax Jurisdictions
 
Open Tax Years
 
U.S.
           
Federal
   
2015
through
2018
 
State (various)
   
2015
through
2018
 
             
Europe
           
United Kingdom
   
2015
through
2018
 
France
   
2016
through
2018
 
Germany
   
2017
through
2018