Restructuring	6 Months Ended
Sep. 30, 2020
Restructuring And Related Activities [Abstract]
Restructuring	15. RESTRUCTURING As disclosed in the Company's Form 10-K for the fiscal year ended March 31, 2020, during the fiscal years ended March 31, 2017 and 2016, the Company committed to restructuring plans involving certain of its businesses, as well as the consolidation of certain of its facilities. With the exception of certain consolidations to be completed in future years, these plans were substantially complete as of March 31, 2020. During the six months ended September 30, 2020, the Company incurred costs of $4,536, $17,698, and $6,442, within Systems and Support, Aerospace Structures, and its corporate headquarters, respectively, for total restructuring costs of $28,676 associated with new restructuring plans. Of the restructuring costs within Aerospace Structures, approximately $13,097 pertained to facility closures with the remainder primarily related to postemployment benefits arising from reductions in force and third-party consulting costs. The restructuring costs within Systems & Support and Corporate are primarily related to postemployment benefits arising from reductions in force and third-party consulting costs. We estimate that we will incur costs in each of our segments for third-party consulting costs and severance, primarily related to our cost-reductions, of approximately $32,000 to $34,000 for the fiscal year ended March 31, 2021.

Restructuring

6 Months Ended

Sep. 30, 2020

Restructuring And Related Activities [Abstract]

15. RESTRUCTURING

As disclosed in the Company's Form 10-K for the fiscal year ended March 31, 2020, during the fiscal years ended March 31, 2017 and 2016, the Company committed to restructuring plans involving certain of its businesses, as well as the consolidation of certain of its facilities. With the exception of certain consolidations to be completed in future years, these plans were substantially complete as of March 31, 2020. During the six months ended September 30, 2020, the Company incurred costs of $4,536, $17,698, and $6,442, within Systems and Support, Aerospace Structures, and its corporate headquarters, respectively, for total restructuring costs of $28,676 associated with new restructuring plans. Of the restructuring costs within Aerospace Structures, approximately $13,097 pertained to facility closures with the remainder primarily related to postemployment benefits arising from reductions in force and third-party consulting costs. The restructuring costs within Systems & Support and Corporate are primarily related to postemployment benefits arising from reductions in force and third-party consulting costs. We estimate that we will incur costs in each of our segments for third-party consulting costs and severance, primarily related to our cost-reductions, of approximately $32,000 to $34,000 for the fiscal year ended March 31, 2021.