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Concentration of Risk Concentration of Risk (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
employee
Mar. 31, 2019
Mar. 31, 2020
USD ($)
employee
Mar. 31, 2019
Jun. 30, 2019
USD ($)
Concentration Risk [Line Items]          
Customer Concentration In Prepaid Expenses $ 1,000   $ 1,000   $ 1,000
Customer Concentration In Other Current Assets 4,000   4,000   4,000
Customer Concentration In Other Assets 35,000   35,000   36,000
Customer Concentration $ 40,000   $ 40,000   $ 41,000
Concentration Risk, Number of Employees Labor Subject to Collective Bargaining Arrangements | employee 500   500    
Concentration Risk, Percentage of Employees Labor Subject to Collective Bargaining Arrangements 73.00%   73.00%    
Concentration Risk, Percentage of Employees Labor Subject to Collective Bargaining Arrangements that already expired as of the current quarter end 44.00%   44.00%    
Concentration Risk, Percentage of Employees Labor Subject to Collective Bargaining Arrangements that expire within the next fiscal year 18.00%   18.00%    
Customer A [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 26.00%   26.00%   25.00%
Customer B [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 25.00%   25.00%   25.00%
Customer C [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 22.00%   22.00%   23.00%
Customer D [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 12.00%   12.00%   14.00%
Customer 1 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 24.00% 23.00% 25.00% 23.00%  
Customer 2 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 23.00% 21.00% 23.00% 22.00%  
Customer 3 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 19.00% 19.00% 20.00% 21.00%  
Customer 4 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 8.00% 10.00% 9.00% 11.00%