Supplemental Guarantor Information (Level 4 Senior Note table) (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2018	Sep. 05, 2012
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 2,659,898	$ 2,861,375
Senior Notes Due 2022 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 419,876
Interest rate on notes	5.875%
Senior Notes Due 2023 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 400,000
Interest rate on notes	4.375%
Senior Notes Due 2024 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 250,000
Interest rate on notes	5.63%
4.875% Senior Notes Due 2025 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 350,000	350,000
Interest rate on notes	4.875%
4.875% Senior Notes Due 2027 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 450,000	450,000
Interest rate on notes	4.875%
4.350% Senior Notes Due 2028 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 400,000	400,000	$ 400,000
Interest rate on notes	4.35%		4.35%
Senior Notes Due 2032 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Interest rate on notes				0.50%
3.80% Senior Notes Due 2029 [Member]
Supplemental Guarantor Information (Textual) [Abstract]
Senior notes	$ 400,000	$ 0
Interest rate on notes	3.80%