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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Balance Sheet (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 411,381 | $ 233,401 |  | $ 398,484 |  |
Receivables, net | 1,240,521 | 1,166,787 |  | 942,508 |  |
Inventories | 866,205 | 742,634 | $ 742,634 | 658,510 |  |
Current assets - other | 111,441 | 122,291 |  | 868,129 |  |
Total current assets | 4,353,548 | 2,265,113 |  | 2,867,631 |  |
Property, plant and equipment | 557,423 | 573,972 |  | 518,376 | $ 353,193 |
Goodwill | 2,412,554 | 2,460,103 |  | 2,078,765 |  |
Investment in subsidiaries | 0 | 0 |  | 0 |  |
Other intangibles, net | 1,157,424 | 1,204,432 |  | 1,053,860 |  |
Other noncurrent assets | 72,277 | 76,360 |  | 62,386 |  |
Total Assets | 8,553,226 | 6,579,980 |  | 6,581,018 | 3,229,513 |
Current liabilities | 1,530,293 | 1,573,330 |  | 1,446,639 |  |
Inter-company | 0 | 0 |  | 0 |  |
Long-term debt | 3,818,061 | 1,823,303 |  | 1,762,967 |  |
Long-term liabilities - other | 294,520 | 354,815 |  | 394,587 |  |
Total liabilities | 5,642,874 | 3,751,448 |  | 3,604,193 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 2,895,170 | 2,808,868 |  | 2,205,977 |  |
Noncontrolling interest | 15,182 | 19,664 |  | 770,848 |  |
Total equity | 2,910,352 | 2,828,532 |  | 2,976,825 | $ 1,701,339 | $ 1,808,974
Total Liabilities and Equity | 8,553,226 | 6,579,980 |  | 6,581,018 |  |
Elimination |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Receivables, net | 0 | 0 |  | 0 |  |
Inventories | 0 | 0 |  | 0 |  |
Current assets - other | 0 | 0 |  | 0 |  |
Total current assets | 0 | 0 |  | 0 |  |
Property, plant and equipment | 0 | 0 |  | 0 |  |
Goodwill | 0 | 0 |  | 0 |  |
Investment in subsidiaries | (9,431,604) | (8,957,870) |  | (7,349,649) |  |
Other intangibles, net | 0 | 0 |  | 0 |  |
Other noncurrent assets | 0 | 0 |  | 0 |  |
Total Assets | (9,431,604) | (8,957,870) |  | (7,349,649) |  |
Current liabilities | 0 | 0 |  | 0 |  |
Inter-company | 0 | 0 |  | 0 |  |
Long-term debt | 0 | 0 |  | 0 |  |
Long-term liabilities - other | 0 | 0 |  | 0 |  |
Total liabilities | 0 | 0 |  | 0 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | (9,431,604) | (8,957,870) |  | (7,349,649) |  |
Noncontrolling interest | 0 | 0 |  | 0 |  |
Total equity | (9,431,604) | (8,957,870) |  | (7,349,649) |  |
Total Liabilities and Equity | (9,431,604) | (8,957,870) |  | (7,349,649) |  |
Parent |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 933 |  | 2,522 |  |
Receivables, net | 117,117 | 77,046 |  | 79,041 |  |
Inventories | 147,208 | 120,937 |  | 120,042 |  |
Current assets - other | (14,278) | 1,142 |  | 52,576 |  |
Total current assets | 2,010,852 | 200,058 |  | 254,181 |  |
Property, plant and equipment | 49,355 | 52,532 |  | 49,031 |  |
Goodwill | 25,275 | 25,274 |  | 25,275 |  |
Investment in subsidiaries | 6,686,158 | 6,517,205 |  | 5,388,613 |  |
Other intangibles, net | 29,585 | 30,575 |  | 31,897 |  |
Other noncurrent assets | 20,595 | 17,414 |  | 9,592 |  |
Total Assets | 8,821,820 | 6,843,058 |  | 5,758,589 |  |
Current liabilities | 198,264 | 196,827 |  | 194,983 |  |
Inter-company | 1,909,286 | 2,121,546 |  | 1,562,399 |  |
Long-term debt | 3,804,601 | 1,661,771 |  | 1,761,933 |  |
Long-term liabilities - other | 14,499 | 54,046 |  | 33,298 |  |
Total liabilities | 5,926,650 | 4,034,190 |  | 3,552,613 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 2,895,170 | 2,808,868 |  | 2,205,976 |  |
Noncontrolling interest | 0 | 0 |  | 0 |  |
Total equity | 2,895,170 | 2,808,868 |  | 2,205,976 |  |
Total Liabilities and Equity | 8,821,820 | 6,843,058 |  | 5,758,589 |  |
Guarantors |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 625 |  | 1,226 |  |
Receivables, net | 70,128 | 59,166 |  | 74,105 |  |
Inventories | 63,186 | 46,626 |  | 52,372 |  |
Current assets - other | 936 | 563 |  | (19,438) |  |
Total current assets | 134,323 | 106,980 |  | 108,265 |  |
Property, plant and equipment | 24,847 | 26,492 |  | 27,096 |  |
Goodwill | 283,241 | 283,242 |  | 284,020 |  |
Investment in subsidiaries | 2,745,446 | 2,440,665 |  | 1,961,036 |  |
Other intangibles, net | 79,169 | 81,037 |  | 83,103 |  |
Other noncurrent assets | (33,748) | (23,892) |  | (41,963) |  |
Total Assets | 3,233,278 | 2,914,524 |  | 2,421,557 |  |
Current liabilities | 89,160 | 77,284 |  | 74,706 |  |
Inter-company | (1,402,141) | (1,307,410) |  | (1,138,540) |  |
Long-term debt | 0 | 14 |  | 58 |  |
Long-term liabilities - other | 11,601 | 20,594 |  | 3,768 |  |
Total liabilities | (1,301,380) | (1,209,518) |  | (1,060,008) |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 4,534,658 | 4,124,042 |  | 3,481,565 |  |
Noncontrolling interest | 0 | 0 |  | 0 |  |
Total equity | 4,534,658 | 4,124,042 |  | 3,481,565 |  |
Total Liabilities and Equity | 3,233,278 | 2,914,524 |  | 2,421,557 |  |
Non-Guarantors |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | 231,843 |  | 394,736 |  |
Receivables, net | 1,053,276 | 1,030,575 |  | 789,362 |  |
Inventories | 655,811 | 575,071 |  | 486,096 |  |
Current assets - other | 124,783 | 120,586 |  | 834,991 |  |
Total current assets | 2,208,373 | 1,958,075 |  | 2,505,185 |  |
Property, plant and equipment | 483,221 | 494,948 |  | 442,249 |  |
Goodwill | 2,104,038 | 2,151,587 |  | 1,769,470 |  |
Investment in subsidiaries | 0 | 0 |  | 0 |  |
Other intangibles, net | 1,048,670 | 1,092,820 |  | 938,860 |  |
Other noncurrent assets | 85,430 | 82,838 |  | 94,757 |  |
Total Assets | 5,929,732 | 5,780,268 |  | 5,750,521 |  |
Current liabilities | 1,242,869 | 1,299,219 |  | 1,176,950 |  |
Inter-company | (507,145) | (814,136) |  | (423,859) |  |
Long-term debt | 13,460 | 161,518 |  | 976 |  |
Long-term liabilities - other | 268,420 | 280,175 |  | 357,521 |  |
Total liabilities | 1,017,604 | 926,776 |  | 1,111,588 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 4,896,946 | 4,833,828 |  | 3,868,085 |  |
Noncontrolling interest | 15,182 | 19,664 |  | 770,848 |  |
Total equity | 4,912,128 | 4,853,492 |  | 4,638,933 |  |
Total Liabilities and Equity | $ 5,929,732 | $ 5,780,268 |  | $ 5,750,521 |  |

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