Components of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013
Debt Instrument [Line Items]
Line of credit, interest at LIBOR, as defined, plus 1.75% and1.25%, respectively	$ 154,000		$ 111,000
Term loan, interest at LIBOR, as defined, plus 1.25%	85,000	100,000
Yen denominated line of credit, interest at LIBOR, as defined,plus 0.625%	2,960		3,036
Total debt	241,960		114,036
Current portion of long-term debt	(20,000)
Long-term debt, less current portion	$ 221,960		$ 114,036