Basis of Presentation and Preparation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012 M contract D W	Oct. 02, 2011 W	Oct. 03, 2010 W
Principles of Consolidation and Presentation
Selling, general and administrative expenses		$ 7.8
Number of weeks in a fiscal year, low end of range	52
Number of weeks in a fiscal year, high end of range	53
Number of weeks in a fiscal year	52	52	53
Revenue Recognition and Contract Costs
Number of types of contracts under which revenue is recognized	3
Number of types of fixed-price contracts	2
Cash and Cash Equivalents
Maximum term of original maturity to classify instrument as cash equivalent (in days)	90
Restricted cash included in "Prepaid expenses and other current assets"	$ 5.0	$ 5.0
Accounts Receivable - Net
Period for billing and collecting unbilled receivables (in months)	12
Period for earning majority of billings in excess of costs (in months)	12
Equipment
Estimated useful lives
Minimum estimated useful lives (in years)	3
Maximum estimated useful lives (in years)	10
Furniture and fixtures
Estimated useful lives
Minimum estimated useful lives (in years)	3
Maximum estimated useful lives (in years)	10
Buildings
Estimated useful lives
Maximum estimated useful lives (in years)	40