Stock Based Compensation Plans (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2011 Stock Option [Member]	Jun. 30, 2012 Stock Option [Member]	Aug. 31, 2011 Restricted Stock [Member] Employees [Member]	Sep. 30, 2012 Restricted Stock [Member] Employees [Member]	Jun. 30, 2012 Restricted Stock [Member] Employees [Member]	Jun. 30, 2012 Restricted Stock [Member] Non Employee Directors [Member]	Aug. 31, 2011 Performance Shares [Member]	Sep. 30, 2012 Performance Shares [Member]	Jun. 30, 2012 Performance Shares [Member]	Sep. 30, 2012 Restricted Stock and Restricted Stock Units [Member]	Sep. 30, 2011 Restricted Stock and Restricted Stock Units [Member]	Sep. 30, 2012 2010PlanMember
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock that may be issued															2,000
Stock options granted to employees	217
Common stock granted, vesting period					3 years	3 years	3 years	3 years	1 year
Stock options granted to employees, term in years					10 years
Stock-based compensation expense			$ 83	$ 73									$ 358	$ 204
Total unrecognized compensation cost related to option awards		496
Common stock granted, shares						70	120	103	38	41	84	49
Upper limit of target grant, shares										62	126	73
Performance-vested restricted stock units, vesting percentage										100.00%	100.00%	100.00%
Total unrecognized compensation cost													$ 2,711