Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Operating Segments and Related Disclosures - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013 Segment	May 31, 2012	Nov. 30, 2012
Operating Statistics [Line Items]
Number of operating segments			2
Percentage of net sales			10.00%		10.00%
Sales directly and indirectly to the U.S. government and its agencies, including sales to the Company's significant customers	95.00%	95.00%	96.00%	95.00%
Standard Missile Program [Member]
Operating Statistics [Line Items]
Sales directly and indirectly to the U.S. government and its agencies, including sales to the Company's significant customers			32.00%	23.00%