Fair Value Measurements - Various Instruments That Require Fair Value Measurement (Detail) (Fair value on a recurring basis, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	$ 28
Copper derivative contracts	3
Interest Rate Swap	(355)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	0
Copper derivative contracts	0
Interest Rate Swap	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	28
Copper derivative contracts	3
Interest Rate Swap	(355)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	0
Copper derivative contracts	0
Interest Rate Swap	$ 0