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Note 15 - Employee Stock Option and Retirement Plans (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]
(in thousands, except per share data)
  
Number
Outstanding
    
Weighted Average
Exercise Price Per Share
  
Balance at August 31, 2015
    
3,117
     $
100.71
  
Granted – non performance-based
    
622
     $
171.18
  
Granted – performance-based
    
551
     $
165.59
  
Granted – non-employee Directors grant
    
23
     $
146.82
  
Exercised
    
(681
)
   $
71.52
  
Forfeited
    
(268
)
   $
113.70
  
Balance at August 31, 2016
    
3,364
     $
129.54
  
Granted – non performance-based
    
713
     $
152.89
  
Granted – performance-based
    
291
     $
166.29
  
Granted – non-employee Directors grant
    
24
     $
170.24
  
Exercised
    
(487
)
   $
86.17
  
Forfeited
    
(539
)
   $
160.31
  
Balance at August 31, 2017
    
3,366
     $
139.29
  
Granted – non performance-based
    
575
     $
190.14
  
Granted – performance-based
    
17
     $
200.20
  
Granted – non-employee Directors grant
    
19
     $
197.75
  
Exercised
    
(622
)
   $
113.73
  
Forfeited
    
(212
)
   $
158.14
  
Balance at August 31, 2018
    
3,143
     $
153.05
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
       
Outstanding
    
Exercisable
  
Range of Exercise Prices Per Share
  
Number
Outstanding
    
Weighted Average Remaining Years of Contractual Life
    
Weighted Average Exercise Price Per Share
    
Aggregate Intrinsic Value
    
Number Exercisable
    
Weighted Average Exercise Price Per Share
    
Aggregate Intrinsic Value
  
$87.26
-
$92.22
    
333
      
3.9
     $
91.75
     $
45,794
      
333
     $
91.75
     $
45,794
  
$94.84
-
$110.31
    
180
      
4.1
     $
99.24
     $
23,459
      
137
     $
98.18
     $
17,914
  
$131.31
-
$148.52
    
403
      
6.1
     $
134.93
     $
38,071
      
173
     $
131.54
     $
16,889
  
$150.81
-
$152.28
    
637
      
8.1
     $
152.25
     $
49,139
      
124
     $
152.23
     $
9,551
  
$159.14
-
$170.24
    
627
      
7.8
     $
165.23
     $
40,227
      
110
     $
163.55
     $
7,262
  
$171.22
-
$175.20
    
383
      
7.2
     $
175.06
     $
20,816
      
145
     $
175.06
     $
7,887
  
$189.98
-
$200.20
    
580
      
9.2
     $
190.68
     $
22,462
      
—
     $
—
     $
—
  
                                                             
Total Fiscal 2018
    
3,143
      
 
      
 
     $
239,9684
      
1,022
      
 
     $
105,297
  
Share-based Compensation, Stock Options, Activity [Table Text Block]
           
August 31, 2017
            
August 31, 2016
  
   
Number of
Shares
    
Weighted Average
Exercise Price Per Share
    
Number of Shares
    
Weighted Average
Exercise Price Per Share
  
Outstanding at fiscal year end
    
3,366
     $
139.29
      
3,364
     $
129.54
  
Exercisable at fiscal year end
    
918
     $
105.14
      
970
     $
89.42
  
Schedule of Share-based Compensation Vesting Percentage and Related Expenses [Table Text Block]
(in thousands
,
except vesting percentage data)
 
Vesting Percentage
  
Cumulative
Catch-up Adjustment
(1)
    
Remaining Expense
to be Recognized
  
0% (current expectation)
   $
—
     $
—
  
100%
   $
613
     $
1,272
  
(in thousands
,
except vesting percentage data)
 
Vesting Percentage
  
 
Cumulative
Catch-up Adjustment
(1)
    
 
Remaining Expense
to be Recognized
  
0%(current expectation)
   $
—
     $
—
  
80%
   $
1,658
     $
5,449
  
90%
   $
1,866
     $
6,130
  
100%
   $
2,073
     $
6,811
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
(in thousands, except per award data)
  
Number Outstanding
    
Weighted Average Grant
Date Fair Value Per Award
  
Balance at August 31, 2015
    
313
     $
103.34
  
Granted (restricted stock and stock units)
    
97
     $
159.64
  
Vested
(
1
)
    
(69
 )   $
85.04
  
Canceled/forfeited
    
(79
 )   $
112.51
  
Balance at August 31, 2016
    
262
     $
126.27
  
Granted (restricted stock and stock units)
    
62
     $
158.26
  
Vested
(
2
)
    
(132
 )   $
123.28
  
Canceled/forfeited
    
(10
 )   $
130.32
  
Balance at August 31, 2017
    
182
     $
138.62
  
Granted (restricted stock and stock units)
    
4
     $
189.28
  
Vested
(3)
    
(27
 )   $
155.95
  
Canceled/forfeited
    
(16
 )   $
116.29
  
Balance at August 31, 2018
    
143
     $
139.34
  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
(in thousands)
  
Share-based Awards
Available for Grant under the
Employee Stock Option Plan
    
Share-based Awards
Available for Grant under the
Non-Employee Stock Option Plan
  
Balance at August 31, 2015
    
2,441
      
88
  
Granted – non performance-based options
    
(622
 )    
—
  
Granted – performance-based options
    
(551
 )    
—
  
Granted – non-employee Directors grant
    
—
      
(22
 )
Restricted stock awards granted
(1)
    
(243
 )    
—
  
Share-based awards canceled/forfeited
(2)
    
466
      
—
  
Balance at August 31, 2016
    
1,491
      
66
  
Granted – non performance-based options
    
(713
 )    
—
  
Granted – performance-based options
    
(291
 )    
—
  
Granted – non-employee Directors grant
    
—
      
(24
 )
Restricted stock awards granted
(1)
    
(156
 )    
—
  
Share-based awards canceled/forfeited
(2)
    
566
      
—
  
Balance at August 31, 2017
    
897
      
42
  
Increase in the number of shares available for issuance
    
5,750
      
250
  
Granted – non performance-based options
    
(575
 )    
—
  
Granted – performance-based options
    
(17
 )    
—
  
Granted – non-employee Directors grant
    
—
      
(19
 )
Restricted stock awards granted
(1)
    
(9
 )    
—
  
Share-based awards canceled/forfeited
(2)
    
252
      
9
  
Balance at August 31, 2018
    
6,298
      
282