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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Net sales									$ 4,376,972	$ 3,994,515
Gross profit									1,235,821	1,099,878
Net income attributable to Wabtec shareholders									$ 292,207	$ 273,301
Diluted earnings per share
As Reported (in dollars per share)	$ 0.36	$ 0.91	$ 0.87	$ 0.92	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 3.05	$ 2.72	$ 3.34
Pro forma (in dollars per share)									$ 3.06	$ 2.84

X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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