Revolving Credit Facility - Additional Information (Detail) - Revolving Credit Facility [Member] - USD ($)		6 Months Ended
	Nov. 02, 2016	Mar. 31, 2017
Line Of Credit Facility [Line Items]
Revolving credit facility amount	$ 30,000,000
Line of credit facility, expiration period	3 years
Credit facility fee percentage	0.15%
Line of credit facility expiration month and year		2019-11
Debt outstanding		$ 0
Minimum [Member]
Line Of Credit Facility [Line Items]
Credit facility interest rate	1.00%
Maximum [Member]
Line Of Credit Facility [Line Items]
Credit facility interest rate	1.75%
Multi-currency Overdraft Facility [Member] | Ireland
Line Of Credit Facility [Line Items]
Line of credit facility additional borrowing capacity	$ 5,000,000
Credit facility incremental of additional borrowings	5,000,000
Multi-currency Overdraft Facility [Member] | Maximum [Member] | Ireland
Line Of Credit Facility [Line Items]
Line of credit facility additional borrowing capacity	$ 20,000,000