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Subsequent Event	12 Months Ended
Subsequent Event	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	24. Subsequent Event On November 13, 2018, the Company announced it had acquired all of the intellectual property and related assets of the OptoSeis^® fiber optic sensing technology business from PGS Americas, Inc. The OptoSeis^® business operations will remain in Austin, Texas and operate as a division of the Company. The purchase price for the OptoSeis^® technology consisted of a cash down payment at closing of $1.8 million plus contingent earn-out payments of up to $23.2 million over a five-and-a-half year earn-out period. The contingent cash payments will be derived from eligible revenues generated during the earn-out period from products and services utilizing the OptoSeis^® fiber optic technology.