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Commitments and Contingencies (Details)
 1 Months Ended 2 Months Ended
Dec. 31, 2017
item
Sep. 30, 2015
pharmacy
Feb. 28, 2006
lawsuit
item
director
Sep. 30, 2017
complaint
Jun. 30, 2018
item
store
Loss contingencies          
Number of store leases guaranteed | store         85
Number of material accruals for outstanding legal matters         0
Number of pharmacies indicated in subpoena | pharmacy   8      
Omnicare, Inc.          
Loss contingencies          
New claims filed, number | lawsuit     2    
Number of officers named in lawsuit     3    
Number of directors named in lawsuit | director     2    
National Opioid Litigation          
Loss contingencies          
the number of relevant federal court cases that named the company 200        
The number of relevant state court cases that named the company 25        
Shareholder Matters          
Loss contingencies          
Number of complaints | complaint       4  
Number of complaints filed in Rhode Island | complaint       3