Funded Status and Amounts Recognized in Consolidated Balance Sheet (Detail) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 15,914	$ 14,390
Acquisition date benefit obligations from entities acquired during the fiscal year	10,354
Service cost	216	100
Interest cost	796	775
Actuarial loss	2,138	1,380
Benefits paid	(356)	(731)
Foreign currency translation	(994)
Benefit obligation at end of year	28,068	15,914
Fair value of assets at beginning of year	9,990	5,860
Acquisition date fair value of assets for entities acquired during the fiscal year	9,226
Actual return (loss) on plan assets	1,322	657
Disbursements	(356)	(731)
Employer contributions	778	4,204
Employee contributions	76
Foreign currency translation	(863)
Fair value of assets at end of year	20,173	9,990
Funded status/accrued benefit liability	$ (7,895)	$ (5,924)