Consolidated Balance Sheet Parentheical (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Allowance for doubtful accounts	$ 4,807	$ 3,900
Unliquidated progress payments	$ 157,330	$ 164,450
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,002,759	49,590,273
Common stock, shares outstanding	49,925,765	59,531,740
Treasury stock, shares outstanding	76,994	58,533