Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (AOCI) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Mar. 31, 2013		Mar. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
Cost of revenues	$ (34,150)		$ (26,300)	$ (55,056)		$ (52,555)
Interest expense	(554)		(2,591)	(1,836)		(5,230)
Operating expenses	(11,049)		(8,823)	(21,513)		(18,308)
Income from Continuing Operations before Income Tax	4,295		2,211	5,134		2,338
Income tax expense	(1,534)		(974)	(1,222)		(1,066)
Net Income	2,732		1,055	3,887		1,206
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Line Items]
Net Income	(664)	[1]		(1,328)	[1]
Reclassification out of Accumulated Other Comprehensive Income | Gains (Losses) on Effective Cash Flow Hedge
Accumulated Other Comprehensive Income [Line Items]
Income tax expense	22	[1]		22	[1]
Net Income	(34)	[1]		(34)	[1]
Reclassification out of Accumulated Other Comprehensive Income | Gains (Losses) on Effective Cash Flow Hedge | Interest Rate Swap
Accumulated Other Comprehensive Income [Line Items]
Interest expense	(56)	[1]		(56)	[1]
Reclassification out of Accumulated Other Comprehensive Income | Gains (Losses) on Defined Benefit Plan Items
Accumulated Other Comprehensive Income [Line Items]
Cost of revenues	(538)	[1]		(1,076)	[1]
Operating expenses	(568)	[1]		(1,138)	[1]
Income from Continuing Operations before Income Tax	(1,106)	[1]		(2,214)	[1]
Income tax expense	$ 442	[1]		$ 886	[1]

[1] amounts in parenthesis represent a decrease to income