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COMMITMENTS AND CONTINGENCIES Guarantees (Details)
 3 Months Ended
Sep. 30, 2020
Guarantees and Product Warranties [Abstract]  
Guarantor Obligations, Origin and Purpose Due to the nature of WESCO’s arrangement with WESTEC, WESCO has provided a standby letter of credit under its revolving credit facility of up to $7.3 million as security for WESTEC’s debt facilities.