Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts (Detail) - Not Designated as Hedging Instrument - Foreign Exchange Contract - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Fair Value of Assets	$ 25	$ 0
Fair Value of Liabilities	72	58
Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets	6	0
Fair Value of Liabilities	0	11
Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Assets	8	0
Fair Value of Liabilities	0	15
Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	0	5
Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Fair Value of Assets	1	0
Fair Value of Liabilities	0	5
Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	66
Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen, Two
Derivative [Line Items]
Fair Value of Assets	8
Fair Value of Liabilities	0
Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	5	5
Buy Currency, Euro; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets	2
Fair Value of Liabilities	0
Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	1	1
Buy Currency, U.S. Dollar; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		16
Long | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	1,296	1,736
Long | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	1,143	3,513
Long | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	583	656
Long | Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	534	650
Long | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount	10,100
Long | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen, Two
Derivative [Line Items]
Notional Amount	759
Long | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	793	731
Long | Buy Currency, Euro; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	232
Long | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount	60	76
Long | Buy Currency, U.S. Dollar; Sell Currency, Euro
Derivative [Line Items]
Notional Amount		1,395
Short | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	160,000	190,000
Short | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	1,600	4,500
Short | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	18,000	20,000
Short | Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	840	400
Short | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount	11,368
Short | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen, Two
Derivative [Line Items]
Notional Amount	93,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	3,000	2,700
Short | Buy Currency, Euro; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	32,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount	$ 67,000	80,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Euro
Derivative [Line Items]
Notional Amount		$ 1,100