The company closed the C$3.6 billion ($2.67 billion)acquisition of WS Atkins in July as its seeks to reduce its exposure to oil and gas, while bolstering its position in nuclear, rail and transportation and infrastructure businesses.

The business contributed C$805.3 million to the company's revenue of C$2.63 billion, which rose 21 percent in the third quarter.

However, costs also rose to C$399 million from C$141.1 million, the company said.

Net income attributable to shareholders rose to C$103.6 million ($80.64 million), or 59 Canadian cents per share, for the quarter ended Sept. 30 from C$43.3 million, or 29 Canadian cents per share, a year earlier.

Excluding items, SNC posted a profit of 51 Canadian cents per share, missing the average analysts' estimate of 56 Canadian cents per share, according to Thomson Reuters I/B/E/S.

(Reporting by Akshara P in Bengaluru; Editing by Anil D'Silva)