Consolidated Balance Sheet Parenthetical (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Allowance for doubtful accounts	$ 4,028	$ 4,559
Unliquidated progress payments	$ 409,040	$ 222,485
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	52,460,920	52,460,920
Common stock, shares outstanding	49,662,507	49,573,029
Treasury Stock, Shares	2,798,413	2,887,891