Notional Amounts Outstanding under Foreign Currency Contracts (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Derivative [Line Items]
Notional Amount of Buy Currency	$ 4,780
Notional Amount of Sell Currency in U.S. Dollars	4,793
Fair Value of Assets
Fair Value of Liabilities	13
Buy Currency, U.S. Dollar, Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount of Buy Currency	1,290
Maturity	2012-07
Notional Amount of Sell Currency in U.S. Dollars	1,294
Fair Value of Assets
Fair Value of Liabilities	4
Buy Currency, U.S. Dollar, Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount of Buy Currency	1,000
Maturity	2012-07
Notional Amount of Sell Currency in U.S. Dollars	1,001
Fair Value of Assets
Fair Value of Liabilities	1
Buy Currency, U.S. Dollar, Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount of Buy Currency	1,006
Maturity	2012-07
Notional Amount of Sell Currency in U.S. Dollars	1,006
Fair Value of Assets
Buy Currency, U.S. Dollar, Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount of Buy Currency	935
Maturity	2012-07
Notional Amount of Sell Currency in U.S. Dollars	943
Fair Value of Assets
Fair Value of Liabilities	8
Buy Currency, U.S. Dollar, Sell Currency, British Pound
Derivative [Line Items]
Notional Amount of Buy Currency	549
Maturity	2012-07
Notional Amount of Sell Currency in U.S. Dollars	549
Fair Value of Assets