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Stockholders' Equity - Additional Disclosures (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Additional disclosures                
Unrecognized expense related to all stock-based compensation (in dollars)         $ 5,397      
Period over which unrecognized expense related to all stock based compensation will be recognized         5 years      
2005 Incentive Plan                
Additional disclosures                
Common stock available for future issuance (in shares)         39,473      
Non-employee members of BOD                
Additional disclosures                
Outstanding at the end of the period (in shares)         4,906 4,599 2,779 2,407
Officers and employees                
Options Exercisable                
Number Exercisable (in shares)         99,080      
Weighted Average Exercise Price (in dollars per share)         $ 57.96      
Options outstanding                
Options outstanding at the beginning of the period (in shares)         101,254 99,190 152,974  
Granted (in shares)         67,060 9,086 10,228  
Exercised (in shares)         (3,618) (7,022) (64,012)  
Options outstanding at the end of the period (in shares)         164,696 101,254 99,190  
Weighted Average Exercise Price                
Options outstanding at the beginning of the period (in dollars per share)         $ 57.18 $ 50.17 $ 34.21  
Exercise price (in dollars per share)         100.22 122.64 94.12  
Exercised (in dollars per share)         34.21 42.86 19.06  
Options outstanding at the end of the period (in dollars per share)         $ 75.21 $ 57.18 $ 50.17  
Additional disclosures                
Outstanding at the end of the period (in shares)         59,875 44,355 65,579 73,972
Stock options                
Options Outstanding                
Number Outstanding (in shares)         164,696      
Weighted Avg. Remaining Contractual Life         6 years 9 months 18 days      
Weighted Average Exercise Price (in dollars per share)         $ 75.21      
Aggregate Intrinsic Value (in dollars)         $ 4,092      
Options Exercisable                
Number Exercisable (in shares)         99,080      
Weighted Average Exercise Price (in dollars per share)         $ 57.96      
Aggregate Intrinsic Value (in dollars)         $ 4,092      
Additional disclosures                
Weighted average grant date fair value of options granted (in dollars per share)         $ 29.79 $ 40.12 $ 30.99  
Total pretax intrinsic value of stock options exercised (in dollars)         $ 311 $ 403 $ 6,714  
Common stock available for future issuance (in shares)           949,398    
Tax (expense) / benefit realized from stock options exercised, vesting of restricted stock and issuance of stock pursuant to grants of restricted stock units (in dollars)         149 $ 157 $ 1,921  
Unrecognized expense related to all stock-based compensation (in dollars)         $ 1,261      
Stock options | $16.00                
Options Outstanding                
Number Outstanding (in shares)         5,065      
Weighted Avg. Remaining Contractual Life         2 years 1 month 6 days      
Weighted Average Exercise Price (in dollars per share)         $ 16.00      
Aggregate Intrinsic Value (in dollars)         $ 413      
Options Exercisable                
Number Exercisable (in shares)         5,065      
Weighted Average Exercise Price (in dollars per share)         $ 16.00      
Aggregate Intrinsic Value (in dollars)         $ 413      
Stock options | $29.72                
Options Outstanding                
Number Outstanding (in shares)         13,790      
Weighted Avg. Remaining Contractual Life         3 years      
Weighted Average Exercise Price (in dollars per share)         $ 29.72      
Aggregate Intrinsic Value (in dollars)         $ 936      
Options Exercisable                
Number Exercisable (in shares)         13,790      
Weighted Average Exercise Price (in dollars per share)         $ 29.72      
Aggregate Intrinsic Value (in dollars)         $ 936      
Stock options | $35.50                
Options Outstanding                
Number Outstanding (in shares)         13,372      
Weighted Avg. Remaining Contractual Life         4 years      
Weighted Average Exercise Price (in dollars per share)         $ 35.50      
Aggregate Intrinsic Value (in dollars)         $ 830      
Options Exercisable                
Number Exercisable (in shares)         13,372      
Weighted Average Exercise Price (in dollars per share)         $ 35.50      
Aggregate Intrinsic Value (in dollars)         $ 830      
Stock options | $39.50                
Options Outstanding                
Number Outstanding (in shares)         12,753      
Weighted Avg. Remaining Contractual Life         5 years      
Weighted Average Exercise Price (in dollars per share)         $ 39.50      
Aggregate Intrinsic Value (in dollars)         $ 741      
Options Exercisable                
Number Exercisable (in shares)         12,753      
Weighted Average Exercise Price (in dollars per share)         $ 39.50      
Aggregate Intrinsic Value (in dollars)         $ 741      
Stock options | $64.37                
Options Outstanding                
Number Outstanding (in shares)         34,260      
Weighted Avg. Remaining Contractual Life         6 years      
Weighted Average Exercise Price (in dollars per share)         $ 64.37      
Aggregate Intrinsic Value (in dollars)         $ 1,137      
Options Exercisable                
Number Exercisable (in shares)         34,260      
Weighted Average Exercise Price (in dollars per share)         $ 64.37      
Aggregate Intrinsic Value (in dollars)         $ 1,137      
Stock options | $93.50                
Options Outstanding                
Number Outstanding (in shares)         8,704      
Weighted Avg. Remaining Contractual Life         7 years      
Weighted Average Exercise Price (in dollars per share)         $ 93.50      
Aggregate Intrinsic Value (in dollars)         $ 35      
Options Exercisable                
Number Exercisable (in shares)         8,704      
Weighted Average Exercise Price (in dollars per share)         $ 93.50      
Aggregate Intrinsic Value (in dollars)         $ 35      
Stock options | $99.38                
Options Outstanding                
Number Outstanding (in shares)         483      
Weighted Avg. Remaining Contractual Life         8 years      
Weighted Average Exercise Price (in dollars per share)         $ 99.38      
Options Exercisable                
Number Exercisable (in shares)         322      
Weighted Average Exercise Price (in dollars per share)         $ 99.38      
Stock options | 100.22                
Options Outstanding                
Number Outstanding (in shares)         67,060      
Weighted Avg. Remaining Contractual Life         9 years      
Weighted Average Exercise Price (in dollars per share)         $ 100.22      
Options Exercisable                
Number Exercisable (in shares)         4,473      
Weighted Average Exercise Price (in dollars per share)         $ 100.22      
Stock options | 104.00                
Options Outstanding                
Number Outstanding (in shares)         606      
Weighted Avg. Remaining Contractual Life         7 years 6 months      
Weighted Average Exercise Price (in dollars per share)         $ 104.00      
Options Exercisable                
Number Exercisable (in shares)         606      
Weighted Average Exercise Price (in dollars per share)         $ 104.00      
Stock options | 123.95                
Options Outstanding                
Number Outstanding (in shares)         8,603      
Weighted Avg. Remaining Contractual Life         8 years      
Weighted Average Exercise Price (in dollars per share)         $ 123.95      
Options Exercisable                
Number Exercisable (in shares)         5,735      
Weighted Average Exercise Price (in dollars per share)         $ 123.95      
Restricted stock                
Additional disclosures                
Unrecognized expense related to all stock-based compensation (in dollars)         $ 4,136      
Restricted stock | Non-employee members of BOD                
Stockholders' Equity                
Vesting period 12 months 12 months 12 months 12 months