Programs Comprising Ten Percent or more of Company's Revenue (Detail)	3 Months Ended				9 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013		Mar. 31, 2012
Segment Reporting Information [Line Items]
Percentage of revenue contributed from a single program	15.00%		21.00%		0.00%		23.00%
Aegis
Segment Reporting Information [Line Items]
Percentage of revenue contributed from a single program	15.00%		10.00%			[1]	11.00%
Patriot
Segment Reporting Information [Line Items]
Percentage of revenue contributed from a single program		[1]	11.00%			[1]		[1]
Joint Strike Fighter
Segment Reporting Information [Line Items]
Percentage of revenue contributed from a single program		[1]		[1]		[1]	12.00%

[1] Indicates that the amount is less than 10% of the Company's revenues for the respective periods.