Revenue Recognition and Contracts with Customers - Schedule of Disaggregated Net Sales Satisfied Overtime and at a Point in Time (Excluding Intercompany Sales) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Amortization of acquired contract liabilities	$ 1,214	$ 10,987
Net sales	396,646	495,077
Systems & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	257,203	234,296
Amortization of acquired contract liabilities	1,202	3,719
Revenues excluding intercompany sales	258,405	238,015
Systems & Support [Member] | Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	118,981	103,348
Systems & Support [Member] | Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	138,222	130,948
Aerospace Structures [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	138,229	249,794
Amortization of acquired contract liabilities	12	7,268
Revenues excluding intercompany sales	138,241	257,062
Aerospace Structures [Member] | Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	129,523	243,639
Aerospace Structures [Member] | Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 8,706	$ 6,155