Legal Matters (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2012 Contract awarded by Iran	Dec. 31, 1997 Contract awarded by Iran	Nov. 30, 2011 Claim from public transit authority customer employee	Mar. 31, 2012 Claim from public transit authority customer Y	Jun. 30, 2012 Claim from public transit authority customer
Legal Matters
Arbitration award amount		$ 2.8
Amount of accrued liability	8.8
Amount of accrued interest	0.2
Amount of pre-judgment interest award	1.4
Amount of damages sought for legal fees	0.1
Number of employees alleged for loss of revenue due to inappropriate and illegal actions			1
Period prior to acquisition of contract during which a former employee was committing illegal acts (in years)				2
Estimated loss of revenue					$ 2.9