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PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payment | $ 0 | $ 0 | $ 18,157,000
Contribution plan expense | 8,620,000 | 8,117,000 | $ 6,819,000
Change in Assumptions for Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Reduction in service and interest cost | 1,960,000 |  |
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | 238,307,000 | 240,329,000 |
Projected benefit obligation | 259,672,000 | $ 263,566,000 |
Required employer contributions | 5,109,000 |  |
Required plan contribution | $ 0 |  |
Target allocation of plan assets (as a percent) | 100.00% |  |
Return on plan assets | 6.75% | 7.25% | 7.75%
Pension | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of plan assets (as a percent) | 50.00% |  |
Pension | Fixed income, cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of plan assets (as a percent) | 30.00% |  |
Other Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Return on plan assets | 0.00% | 0.00% | 0.00%
Per capita cost of health care benefits assumed for next fiscal year (as a percent) | 7.30% |  |
Ultimate health care cost trend rate (as a percent) | 4.00% |  |
Effect of one percentage point increase on accumulated postretirement benefit obligation | $ 718,000 |  |
Effect of one percentage point increase on service and interest cost components | 47,000 |  |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | 822,000 |  |
Effect of one percentage point decrease on service and interest cost components | $ 54,000 |  |
Multiemployer Plan, Pension | Schawk Inc |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement payment |  |  | $ 18,157,000
Gain recognized on settlement |  |  | $ 11,522,000

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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