Remember that the 2015 fiscal year had 53 weeks; this year had 52. In 2015, this extra week was recorded in the 4th quarter. This makes an appreciable difference in Parks & Resorts (P&R) operating income and revenue.
Looking at operating margin for the 4th quarter tells a clearer story.
In 4Q2015, P&R had $738M of operating income on revenue of $4361M, an operating margin of 16.9%.
In 4Q2016, P&R had $699M of operating income on revenue of $4386M, an operating margin of 15.9%.
As has been true for years, Disney's international theme parks (including the new Shanghai Disneyland) continue to drag down P&R financial performance.