Customer Accounts Receivable Delinquency Bucket (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 385,602
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	599,090
Financing Receivable, Originated Two Years before Latest Fiscal Year	262,419
Financing Receivable, Originated Three Years before Latest Fiscal Year	58,561
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	5,228
Carrying value of customer accounts receivable	$ 1,310,900	$ 1,547,645
Percent of Total Accounts Receivable	100.00%
Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 328,980
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	419,220
Financing Receivable, Originated Two Years before Latest Fiscal Year	166,168
Financing Receivable, Originated Three Years before Latest Fiscal Year	28,066
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	1,600
Carrying value of customer accounts receivable	$ 944,034
Percent of Total Accounts Receivable	72.00%
Financial Asset, 1 to 29 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 31,960
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	87,577
Financing Receivable, Originated Two Years before Latest Fiscal Year	47,185
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,001
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	1,197
Carrying value of customer accounts receivable	$ 180,920
Percent of Total Accounts Receivable	13.80%
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 7,513
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,936
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,032
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,078
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	691
Carrying value of customer accounts receivable	$ 54,250
Percent of Total Accounts Receivable	4.10%
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 4,260
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,848
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,117
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,004
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	314
Carrying value of customer accounts receivable	$ 32,543
Percent of Total Accounts Receivable	2.50%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 12,889
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	50,509
Financing Receivable, Originated Two Years before Latest Fiscal Year	24,917
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,412
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	1,426
Carrying value of customer accounts receivable	$ 99,153
Percent of Total Accounts Receivable	7.60%