No category-specific facts could be extracted from this document.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.The main reasons were steady construction progress, particularly on large-scale factory projects, improved profitability during construction, higher productivity, and solid performance by domestic and overseas subsidiaries. The increase in operating profit was attributed to higher completed construction revenue and improved profitability on a non-consolidated basis, stronger sales efforts and cost reductions at domestic subsidiaries, and steady construction progress at overseas subsidiaries.