Customer Accounts Receivable Delinquency Bucket (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 507,134
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	486,776
Financing Receivable, Originated Two Years before Latest Fiscal Year	196,963
Financing Receivable, Originated Three Years before Latest Fiscal Year	36,744
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	3,105
Carrying value of customer accounts receivable	$ 1,230,722	$ 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	$ 418,548
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	316,243
Financing Receivable, Originated Two Years before Latest Fiscal Year	113,741
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,045
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	851
Carrying value of customer accounts receivable	$ 863,428
Percent of Total Accounts Receivable	70.20%
Financial Asset, 1 to 29 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 49,070
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	78,166
Financing Receivable, Originated Two Years before Latest Fiscal Year	36,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,113
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	685
Carrying value of customer accounts receivable	$ 172,614
Percent of Total Accounts Receivable	14.00%
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 12,652
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23,948
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,449
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,805
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	385
Carrying value of customer accounts receivable	$ 53,239
Percent of Total Accounts Receivable	4.30%
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 7,536
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17,974
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,756
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,755
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	264
Carrying value of customer accounts receivable	$ 37,285
Percent of Total Accounts Receivable	3.00%
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	$ 19,328
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	50,445
Financing Receivable, Originated Two Years before Latest Fiscal Year	25,437
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,026
Financing Receivable, Originated Four or More Years before Latest Fiscal Year	920
Carrying value of customer accounts receivable	$ 104,156
Percent of Total Accounts Receivable	8.50%