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Derivative Instruments Notional Amounts Outstanding under Foreign Currency Contracts (Detail) (Foreign Exchange Contract [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
    
Derivative [Line Items]    
Fair Value of Assets $ 34 $ 10
Fair Value of Liabilities (46) 13
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Fair Value of Assets   5
Fair Value of Liabilities   0
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Fair Value of Assets   0
Fair Value of Liabilities   12
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Fair Value of Assets   2
Fair Value of Liabilities   0
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
    
Derivative [Line Items]    
Fair Value of Assets   3
Fair Value of Liabilities   0
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Fair Value of Assets   0
Fair Value of Liabilities   0
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Fair Value of Assets   0
Fair Value of Liabilities   1
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Fair Value of Assets 4  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Fair Value of Assets 18  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Fair Value of Assets 4  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Fair Value of Assets 3  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, Swiss Franc; Sell Currency, British Pound
    
Derivative [Line Items]    
Fair Value of Assets 0  
Fair Value of Liabilities (43)  
Not Designated as Hedging Instrument [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Fair Value of Assets 0  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Fair Value of Assets 5  
Fair Value of Liabilities 0  
Not Designated as Hedging Instrument [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Fair Value of Assets 0  
Fair Value of Liabilities (3)  
Not Designated as Hedging Instrument [Member] | Long [Member]
    
Derivative [Line Items]    
Notional Amount 12,352 7,632
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Notional Amount   2,791
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Notional Amount   1,842
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Notional Amount   1,058
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
    
Derivative [Line Items]    
Notional Amount   806
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount   611
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount   524
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount 3,676  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Notional Amount 2,680  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Notional Amount 1,557  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount 1,219  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, Swiss Franc; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount 1,200  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Notional Amount 891  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Notional Amount 733  
Not Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Notional Amount 396  
Not Designated as Hedging Instrument [Member] | Short [Member]
    
Derivative [Line Items]    
Notional Amount 12,364 7,635
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Notional Amount   2,786
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Notional Amount   1,854
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Notional Amount   1,056
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
    
Derivative [Line Items]    
Notional Amount   803
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount   611
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount   525
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount 3,672  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
    
Derivative [Line Items]    
Notional Amount 2,662  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
    
Derivative [Line Items]    
Notional Amount 1,553  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount 1,216  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, Swiss Franc; Sell Currency, British Pound
    
Derivative [Line Items]    
Notional Amount 1,243  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Notional Amount 891  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
    
Derivative [Line Items]    
Notional Amount 728  
Not Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
    
Derivative [Line Items]    
Notional Amount 399  
Designated as Hedging Instrument [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Fair Value of Assets 8  
Fair Value of Liabilities 0  
Designated as Hedging Instrument [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount 2,037  
Designated as Hedging Instrument [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
    
Derivative [Line Items]    
Notional Amount $ 2,029