Impairment of Goodwill	12 Months Ended
Mar. 31, 2018
Impairment of Goodwill
Impairment of Goodwill	4. Impairment of Goodwill As discussed in Note 1, goodwill is tested for impairment on an annual basis in our fourth fiscal quarter or more frequently if indicators of impairment exist. Based on our goodwill impairment testing for Fiscal 2018, we determined our Roadway Sensors and Transportation Systems reporting units were not impaired as of March 31, 2018, as the estimated fair values of our reporting units exceeded their carrying values at the end of such fiscal years. Based on our goodwill impairment testing for Fiscal 2017, we believe the carrying value of our goodwill in our Agriculture and Weather Analytic reporting unit was impaired as of March 31, 2017, and resulted in approximately $2.2 million impairment charge. We also determined our Roadway Sensors and Transportation Systems reporting units were not impaired as of March 31, 2017. Based on our goodwill impairment testing for Fiscal 2016, we believe the carrying value of our goodwill was not impaired. If our actual financial results, or the plans and estimates used in future goodwill impairment analyses, are lower than our original estimates used to assess impairment of our goodwill, we could incur goodwill impairment charges in the future.

4. Impairment of Goodwill

As discussed in Note 1, goodwill is tested for impairment on an annual basis in our fourth fiscal quarter or more frequently if indicators of impairment exist.

Based on our goodwill impairment testing for Fiscal 2018, we determined our Roadway Sensors and Transportation Systems reporting units were not impaired as of March 31, 2018, as the estimated fair values of our reporting units exceeded their carrying values at the end of such fiscal years. Based on our goodwill impairment testing for Fiscal 2017, we believe the carrying value of our goodwill in our Agriculture and Weather Analytic reporting unit was impaired as of March 31, 2017, and resulted in approximately $2.2 million impairment charge. We also determined our Roadway Sensors and Transportation Systems reporting units were not impaired as of March 31, 2017. Based on our goodwill impairment testing for Fiscal 2016, we believe the carrying value of our goodwill was not impaired. If our actual financial results, or the plans and estimates used in future goodwill impairment analyses, are lower than our original estimates used to assess impairment of our goodwill, we could incur goodwill impairment charges in the future.