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Concentration of Risk Concentration of Risk (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
Jun. 30, 2019
USD ($)
Concentration Risk [Line Items]          
Customer Concentration In Prepaid Expenses $ 3,000   $ 3,000   $ 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 $ 42,000   $ 42,000   $ 41,000
Concentration Risk, Number of Employees Labor Subject to Collective Bargaining Arrangements | employee 490   490    
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 48.00%   48.00%    
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 25.00%   25.00%   25.00%
Customer B [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 24.00%   24.00%   25.00%
Customer C [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 24.00%   24.00%   23.00%
Customer D [Member] | Accounts Receivable [Member]          
Concentration Risk [Line Items]          
Concentration at period end, AR 13.00%   13.00%   14.00%
Customer 1 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 24.00% 23.00% 26.00% 24.00%  
Customer 2 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 22.00% 21.00% 23.00% 23.00%  
Customer 3 [Member] | Sales Revenue, Services, Net [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage Revenues 20.00% 19.00% 21.00% 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%