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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 |  |  |  |  |  |  |

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