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Accumulated Other Comprehensive Income - Changes in AOCI by Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
AOCI Attributable to Parent [Abstract] |  |  |  |
Beginning balance |  |  | $ 708,665 |
OCI, net of tax | $ 6,252 | $ 13,630 | (17,902) | $ 6,192
Ending balance | 703,752 |  | 703,752 |
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
Beginning balance |  |  | 669 |
OCI, net of tax | 6,252 | 13,630 | (17,902) | 6,192
Ending balance | 571 |  | 571 |
Post-retirement benefit plans |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
Beginning balance | (54,514) | (42,372) | (56,050) | (43,474)
OCI before reclassification | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 1,462 | 1,058 | 2,998 | 2,160
OCI, net of tax | 1,462 | 1,058 | 2,998 | 2,160
Ending balance | (53,052) | (41,314) | (53,052) | (41,314)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
OCI before reclassification | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 1,462 | 1,058 | 2,998 | 2,160
OCI, net of tax | 1,462 | 1,058 | 2,998 | 2,160
Currency translation adjustment |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
Beginning balance | (153,601) | (114,673) | (122,259) | (104,604)
OCI before reclassification | 4,108 | 15,412 | (27,234) | 5,343
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
OCI, net of tax | 4,108 | 15,412 | (27,234) | 5,343
Ending balance | (149,493) | (99,261) | (149,493) | (99,261)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
OCI before reclassification | 4,108 | 15,412 | (27,234) | 5,343
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
OCI, net of tax | 4,108 | 15,412 | (27,234) | 5,343
Derivatives |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
Beginning balance | 2,034 | (666) | (3,559) | (2,248)
OCI before reclassification | 979 | (3,294) | 7,065 | (2,218)
Amounts reclassified from AOCI | (306) | 455 | (799) | 961
OCI, net of tax | 673 | (2,839) | 6,266 | (1,257)
Ending balance | 2,707 | (3,505) | 2,707 | (3,505)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
OCI before reclassification | 979 | (3,294) | 7,065 | (2,218)
Amounts reclassified from AOCI | (306) | 455 | (799) | 961
OCI, net of tax | 673 | (2,839) | 6,266 | (1,257)
Parent |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
Beginning balance | (206,081) | (157,711) | (181,868) | (150,326)
OCI before reclassification | 5,087 | 12,118 | (20,169) | 3,125
Amounts reclassified from AOCI | 1,156 | 1,513 | 2,199 | 3,121
OCI, net of tax | 6,243 | 13,631 | (17,970) | 6,246
Ending balance | (199,838) | (144,080) | (199,838) | (144,080)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
OCI before reclassification | 5,087 | 12,118 | (20,169) | 3,125
Amounts reclassified from AOCI | 1,156 | 1,513 | 2,199 | 3,121
OCI, net of tax | 6,243 | 13,631 | (17,970) | 6,246
Post-retirement benefit plans |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
OCI before reclassification | 0 | 0 | 0 | 0
OCI, net of tax | 0 | 0 | 0 | 0
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
Beginning balance | 0 | 0 | 0 | 0
OCI before reclassification | 0 | 0 | 0 | 0
OCI, net of tax | 0 | 0 | 0 | 0
Ending balance | 0 | 0 | 0 | 0
Currency translation adjustment |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
OCI before reclassification | 9 | (1) | 68 | (54)
OCI, net of tax | 9 | (1) | 68 | (54)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
Beginning balance | 336 | 313 | 277 | 366
OCI before reclassification | 9 | (1) | 68 | (54)
OCI, net of tax | 9 | (1) | 68 | (54)
Ending balance | 345 | 312 | 345 | 312
Derivatives |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
OCI before reclassification | 0 | 0 | 0 | 0
OCI, net of tax | 0 | 0 | 0 | 0
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
Beginning balance | 0 | 0 | 0 | 0
OCI before reclassification | 0 | 0 | 0 | 0
OCI, net of tax | 0 | 0 | 0 | 0
Ending balance | 0 | 0 | 0 | 0
Noncontrolling Interest |  |  |  |
AOCI Attributable to Parent [Abstract] |  |  |  |
OCI before reclassification | 9 | (1) | 68 | (54)
OCI, net of tax | 9 | (1) | 68 | (54)
AOCI Attributable to Noncontrolling Interest [Abstract] |  |  |  |
Beginning balance | 336 | 313 | 277 | 366
OCI before reclassification | 9 | (1) | 68 | (54)
OCI, net of tax | 9 | (1) | 68 | (54)
Ending balance | $ 345 | $ 312 | $ 345 | $ 312

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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