Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 210,344	$ 201,562
Less accumulated depreciation and amortization	(145,866)	(132,966)
Property, plant and equipment, net	64,478	68,596
Buildings and land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	55,352	54,330
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	70,719	68,476
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51,813	49,105
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,908	10,451
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,938	17,301
Capital projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,614	$ 1,899