Notional Amounts Outstanding under Foreign Currency Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012
Derivative [Line Items]
Notional Amount of Buy Currency	$ 7,632
Notional Amount of Sell Currency in U.S. Dollars	7,635
Fair Value of Assets	10
Fair Value of Liabilities	13
Buy Currency, U.S. Dollar, Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount of Buy Currency	2,791
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	2,786
Fair Value of Assets	5
Buy Currency, U.S. Dollar, Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount of Buy Currency	1,842
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	1,854
Fair Value of Liabilities	12
Buy Currency, U.S. Dollar, Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount of Buy Currency	1,058
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	1,056
Fair Value of Assets	2
Buy Currency, U.S. Dollar, Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount of Buy Currency	806
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	803
Fair Value of Assets	3
Buy Currency, U.S. Dollar, Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount of Buy Currency	611
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	611
Buy Currency, U.S. Dollar, Sell Currency, British Pound
Derivative [Line Items]
Notional Amount of Buy Currency	524
Maturity	2012-10
Notional Amount of Sell Currency in U.S. Dollars	525
Fair Value of Liabilities	$ 1