Business And Summary Of Significant Accounting Policies | Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Jul. 31, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
New Accounting Pronouncement
Net sales	$ 8,886,101	$ 10,033,397	$ 8,448,471	$ 8,092,353	$ 7,023,620	$ 17,434,420	$ 15,115,973	$ 33,597,841
Cost of products sold	8,359,071	9,416,536	7,922,390	7,576,762	6,566,532	16,384,273	14,143,294	31,482,220
Accounts receivable, net	5,200,039	6,035,716				5,200,039		6,035,716
Inventories	3,022,673	2,965,521				3,022,673		2,965,521
Prepaid expenses and other assets	383,191	403,548				383,191		403,548
Accounts payable	6,233,180	6,962,193				6,233,180		6,962,193
Accrued expenses and other liabilities	$ 1,016,496	1,169,986				$ 1,016,496		1,169,986
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncement
Net sales		11,092,529	9,135,728	8,882,691	7,664,063		16,546,754	36,775,011
Cost of products sold		10,475,668	$ 8,609,647	8,367,100	$ 7,206,975		15,574,075	34,659,390
Accounts receivable, net		5,783,666						5,783,666
Inventories		3,065,218						3,065,218
Prepaid expenses and other assets		288,178						288,178
Accounts payable		6,947,282						6,947,282
Accrued expenses and other liabilities		917,174						917,174
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncement
Net sales				(790,338)			(1,430,781)
Cost of products sold				$ (790,338)			$ (1,430,781)
Accounts receivable, net		252,050						252,050
Inventories		(99,697)						(99,697)
Prepaid expenses and other assets		115,370						115,370
Accounts payable		14,911						14,911
Accrued expenses and other liabilities		$ 252,812						$ 252,812