SELECTED FINANCIAL STATEMENT INFORMATION, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Oct. 31, 2016
Accrued employee compensation and related payroll taxes	$ 78,058	$ 67,660
Deferred revenue	29,247	32,135
Accrued customer rebates and credits	12,866	11,881
Accrued additional purchase consideration	7,588	6,918
Other Liabilities, Current	19,853	17,459
Accrued expenses and other current liabilities	$ 147,612	$ 136,053