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BENEFIT PLANS - Collective Bargaining Agreements (Details)
 12 Months Ended
Jul. 31, 2021
employee
agreement
store
Retirement Benefits [Abstract]  
Number of employees 28,300
Number of employees covered by collective bargaining agreements 11,000
Number of collective bargaining agreements | agreement 48
Number of collective bargaining agreements renegotiated | agreement 20
Number of employees covered by renegotiated collective bargaining agreements 1,700
Number of collective bargaining agreements expired | agreement 4
Number of employees covered by expired collective bargaining agreements 1,500
Number of collective bargaining agreements scheduled to expire | store 10
Number of employees covered by collective bargaining agreements scheduled to expire 3,300