Income Taxes - Reconciliation of U.S. Statutory Tax Rate to Effective Income Tax Rate (Details)	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
U.S. statutory rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal tax benefit	5.50%	7.80%	6.50%
Federal and state tax credits	(7.50%)	(22.70%)	(9.60%)
Impact of foreign operations	(2.70%)	(5.00%)	(3.60%)
Changes in uncertain tax positions	(19.70%)	(40.00%)	(5.20%)
Incremental tax benefit from share-based compensation awards	(4.20%)	(4.20%)	0.00%
Tax credits for energy efficient government buildings	(2.20%)	(2.40%)	(2.80%)
Nondeductible expenses	5.70%	7.70%	3.80%
Other, net	0.10%	3.80%	1.20%
Annual effective tax rate (benefit)	10.10%	(20.00%)	25.30%