Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2013 item	Sep. 30, 2012
Property, plant and equipment, net
Property, plant and equipment, gross	$ 145,474	$ 138,047
Less accumulated depreciation and amortization	(66,230)	(61,833)
Property, plant and equipment, net	79,244	76,214
Number of equipment under capital leases	0	0
Depreciation and amortization of property, plant and equipment	8,801	7,582	6,770
Land
Property, plant and equipment, net
Property, plant and equipment, gross	8,546	8,379
Buildings
Property, plant and equipment, net
Estimated Useful Life	30 years	30 years
Property, plant and equipment, gross	72,283	68,604
Leasehold improvements
Property, plant and equipment, net
Property, plant and equipment, gross	3,466	2,948
Leasehold improvements | Minimum
Property, plant and equipment, net
Estimated Useful Life	1 year	1 year
Leasehold improvements | Maximum
Property, plant and equipment, net
Estimated Useful Life	7 years	7 years
Furniture, fixtures and equipment
Property, plant and equipment, net
Property, plant and equipment, gross	$ 61,179	$ 58,116
Furniture, fixtures and equipment | Minimum
Property, plant and equipment, net
Estimated Useful Life	3 years	3 years
Furniture, fixtures and equipment | Maximum
Property, plant and equipment, net
Estimated Useful Life	10 years	10 years