Long-Lived Assets (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2011
Schedule of changes in the carrying amount of goodwill
Goodwill, Beginning balance	$ 116,671	$ 116,671
Goodwill related to 2013 acquisition	20,527
Goodwill, Ending balance	137,198	116,671
Number of indefinite lived intangible assets not being amortized	1
Light Building Products
Schedule of changes in the carrying amount of goodwill
Goodwill, Beginning balance	672	672
Goodwill related to 2013 acquisition	20,527
Goodwill, Ending balance	21,199	672
Heavy Construction Materials
Schedule of changes in the carrying amount of goodwill
Goodwill, Beginning balance	115,999	115,999
Goodwill related to 2013 acquisition	0
Goodwill, Ending balance	$ 115,999	$ 115,999