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Components of Balance Sheet Accounts Classified as Assets and Liabilities Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Assets:    
Receivables, net   $ 2,574
Inventories   1,188
Deferred income taxes   47
Prepaid expenses and other current assets   99
Total current assets of business held for sale 0 3,908
Property, plant and equipment, net   2,533
Other assets   43
Total noncurrent assets of business held for sale 0 2,576
Liabilities:    
Current maturities of debt   2
Accounts payable   546
Accrued liabilities   623
Total current liabilities of business held for sale 0 1,171
Deferred income taxes   388
Other long-term liabilities   2
Total noncurrent liabilities of business held for sale $ 0 $ 390