. income tax benefits recognized in the income statement for these compensation arrangements during 2017 , 2016 and 2015 were $ 33 , $ 45 and $ 2 , respectively . as of september 30 , 2017 , total unrecognized compensation expense related to unvested shares awarded under these plans was $ 149 , which is expected to be recognized over a weighted-average period of 1.5 years