SELECTED FINANCIAL STATEMENT INFORMATION, Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017
Accrued employee compensation and related payroll taxes	$ 97,048	$ 78,058
Deferred revenue	28,262	29,247
Accrued customer rebates and credits	16,861	12,866
Accrued additional purchase consideration	6,138	7,588
Other Liabilities, Current	23,205	19,853
Accrued expenses and other current liabilities	$ 171,514	$ 147,612