XML 88 R72.htm IDEA: XBRL DOCUMENT v3.8.0.1
Benefits and Pension Plans (Details)
12 Months Ended
Aug. 31, 2017
USD ($)
item
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
401(k) Plan      
Percent of participant's compensation 3.50%    
401(k) Plan      
Eligibility age for defined contribution plan 21 years    
Minimum eligibility service period 6 months    
Employer match of employee contributions of first percent of eligible compensation (as a percent) 100.00%    
Employer match of employee contributions after the first percent of eligible compensation (as a percent) 50.00%    
Maximum percentage of employee's annual salary, matched by employer 3.50%    
Contribution expense $ 519,000 $ 571,000 $ 394,000
Non-Qualified Deferred Savings Plan      
Recorded liability for Board of Directors and selected employees savings plan $ 979,000 $ 1,649,000  
NEPTCO      
401(k) Plan      
Number of 401(k) savings plans | item 2    
Maximum | NEPTCO      
401(k) Plan      
Percent of annual compensation participants may defer 10.00%    
Minimum | NEPTCO      
401(k) Plan      
Percent of annual compensation participants may defer 1.00%    
Union Employees | NEPTCO      
401(k) Plan      
Number of 401(k) savings plans | item 1    
Amount for each $1.00 of participant deferrals the company may contribute $ 0.50    
Base amount of participant deferrals for company contributions $ 1.00    
Percent of participant's compensation 6.00%    
401(k) Plan      
Maximum percentage of employee's annual salary, matched by employer 6.00%    
Non-union Employees | NEPTCO      
401(k) Plan      
Number of 401(k) savings plans | item 1    
Amount for each $1.00 of participant deferrals the company may contribute $ 0.75    
Base amount of participant deferrals for company contributions $ 1.00    
Percent of participant's compensation 6.00%    
401(k) Plan      
Maximum percentage of employee's annual salary, matched by employer 6.00%