Forward Contracts Outstanding with Total Notional Values (Detail) - Sep. 30, 2016 - Foreign Exchange Forward € in Thousands, £ in Thousands, AUD in Thousands, $ in Thousands	USD ($)	AUD	GBP (£)	EUR (€)
Euro Member Countries, Euros
Derivative [Line Items]
Notional amount | €				€ 21,810
British Pounds
Derivative [Line Items]
Notional amount | £			£ 5,919
Australian Dollar
Derivative [Line Items]
Notional amount | AUD		AUD 19,515
United States of America, Dollars
Derivative [Line Items]
Notional amount | $	$ 59,450