Related Party Transactions (Detail) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2009 Y	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2010 EUR (€) Y	Sep. 30, 2012 EUR (€)
Related party transactions duration of agreement, years	3			5
Amount of transactions with related party during the financial reporting period				€ 6
Total expenses for engineering and software development services		6.9	7.6
Current asset, related party		$ 3.0			€ 2.3