Long-Lived Assets (Tables)

12 Months Ended

Sep. 30, 2014

Property, Plant and Equipment—Property, plant and equipment consisted of the following at September 30:

(in thousands of dollars)	Estimated useful lives	2013			2014
Land and improvements	15 - 40 years	$	11,359		$	15,298
Buildings and improvements	5 - 40 years		61,760			69,018
Equipment and vehicles	3 - 20 years		204,438			222,800
Dies and molds	3 - 20 years		79,248			83,299
Construction in progress	—		11,608			16,402

			368,413			406,817
Less accumulated depreciation			(208,794	)		(224,706	)

Net property, plant and equipment		$	159,619		$	182,111

The table also summarizes the gross carrying amounts and related accumulated amortization of all intangible assets as of September 30:

		2013				2014
(in thousands of dollars)	Estimated useful lives	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Trade names	Indefinite	$	4,800		—	$	15,300		—
CCP contracts	15 - 20 years		106,400	$	58,699		112,300	$	64,192
Customer relationships	5 - 17 years		83,564		44,129		107,953		50,355
Trade names	5 - 20 years		67,790		30,502		67,220		33,394
Patents and patented technologies	5 - 19 years		55,099		46,954		14,526		11,686
Other	3 - 17 years		3,960		1,532		3,935		1,744

		$	321,613	$	181,816	$	321,234	$	161,371

Goodwill—Changes in the carrying amount of goodwill, by segment, are as follows for the two-year period ended September 30, 2014.

(in thousands)	Light building products		Heavy construction materials		Total
Balances as of September 30, 2012	$	672	$	115,999	$	116,671
Goodwill related to 2013 acquisition		20,527		0		20,527

Balances as of September 30, 2013	$	21,199	$	115,999	$	137,198
Goodwill related to 2014 acquisitions		35,488		2,900		38,388

Balances as of September 30, 2014	$	56,687	$	118,899	$	175,586