Common Stock Repurchases - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended			1 Months Ended
	Dec. 09, 2010 Stock Repurchase Plan Maximum	Oct. 31, 2011 Stock Repurchase Plan B.K Medical Distributor	Jan. 31, 2012 Stock Repurchase Plan Group Two	Oct. 31, 2012 Stock Repurchase Plan Two	Dec. 08, 2011 Stock Repurchase Plan Two Maximum	Oct. 31, 2012 Stock Repurchase Plan 3
Stockholders Equity Note [Line Items]
Amount authorized for repurchase of Company's common stock	$ 30,000				$ 30,000
Repurchase of common stock (in shares)		231,700	586,679	56,324		193,915
Repurchase of common stock		$ 11,808	$ 30,000	$ 3,937		$ 12,381
Average purchase price of common stock		$ 50.96	$ 51.14	$ 69.86		$ 63.85