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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 16, 2018
Jun. 14, 2018
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Jul. 10, 2018
Aug. 15, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Description Of Maximum Percentage Of Employee Contributions and Matching Contributions Based Upon Years Of Service         employee contributions and matching Company contributions from 4% to 6%      
Stock repurchase program, authorized amount               $ 100.0
Shares repurchased in period (shares)     1.8   2.8      
Value of shares acquired     $ 42.6   $ 67.3      
Remaining repurchase authorized amount     $ 21.4   $ 21.4      
Cash dividends declared per share (in dollars per share)   $ 0.12 $ 0.12 $ 0 $ 0.12 $ 0    
Relative Total Shareholder Return Average Stock Price Calculation Period         90 days      
Total Shareholder Return Award Performance Measurement Period         3 years      
Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay         4.00%      
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage     0.00%   0.00%      
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay         6.00%      
Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage     200.00%   200.00%      
Equity Incentive Plan 2017 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     4.7   4.7      
Subsequent Event [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in authorized amount of stock repurchase program             $ 100.0  
Dividend payment $ 8.2