Receivables and Financing Arrangements (Notes)	9 Months Ended
Oct. 31, 2017
ReceivablesAndFinancingArrangements [Abstract]
Financing Receivables [Text Block]	RECEIVABLES AND FINANCING ARRANGEMENTS Receivables. The Company's accounts receivable, net primarily consists of amounts due from Credit Receivables (defined below), department store operators that host TIFFANY & CO. boutiques in their stores, third-party credit card issuers and wholesale customers. The Company maintains an allowance for doubtful accounts for estimated losses associated with the accounts receivable recorded on the balance sheet. The allowance is determined based on a combination of factors including, but not limited to, the length of time that the receivables are past due, management's knowledge of the customer, economic and market conditions and historical write-off experiences. For the receivables associated with Tiffany & Co. credit cards ("Credit Card Receivables"), management uses various indicators to determine whether to extend credit to customers and the amount of credit. Such indicators include reviewing prior experience with the customer, including sales and collection history, and using applicants' credit reports and scores provided by credit rating agencies. Certain customers may be granted payment terms which permit purchases above a minimum amount to be paid for in equal monthly installments over a period not to exceed 12 months (together with Credit Card Receivables, "Credit Receivables"). Credit Receivables require minimum balance payments. An account is classified as overdue if a minimum balance payment has not been received within the allotted timeframe (generally 30 days), after which internal collection efforts commence. In order for the account to return to current status, full payment on all past due amounts needs to be received by the Company. For all Credit Receivables recorded on the balance sheet, once all internal collection efforts have been exhausted and management has reviewed the account, the account balance is written off and may be sent for external collection or legal action. At October 31, 2017 and 2016, the carrying amount of the Credit Receivables (recorded in accounts receivable, net) was $62.6 million and $71.2 million, of which 95% and 96% were considered current in the respective periods. The allowance for doubtful accounts for estimated losses associated with the Credit Receivables ($1.2 million at October 31, 2017 and $1.1 million at October 31, 2016) was determined based on the factors discussed above. Finance charges earned on Credit Card accounts are not significant. Financing Arrangements. The Company has provided financing to diamond mining and exploration companies in order to obtain rights to purchase the mine's output. Management evaluates these financing arrangements for potential impairment by reviewing the parties' financial statements along with projections and business, operational and other economic factors on a periodic basis. At October 31, 2017 and 2016, the current portion of the carrying amount of financing arrangements including accrued interest was $1.5 million and $2.3 million, respectively, and was recorded in prepaid expenses and other current assets. At October 31, 2017 and 2016, the non-current portion of the net carrying amount of financing arrangements including accrued interest was $2.3 million and $19.7 million, respectively, and was included in other assets, net. As of January 31, 2017, the Company had a $43.8 million loan receivable under a financing arrangement (the "Loan") with Koidu Limited (previously Koidu Holdings S.A.) ("Koidu"). The Company recorded an impairment charge of $4.2 million during the fiscal year ended January 31, 2017 related to the Loan, resulting in a net carrying amount of $1.7 million as of January 31, 2017 compared with $5.9 million as of October 31, 2016. During the three months ended April 30, 2017, the Company sold its interest in the Loan to Koidu's largest creditor for $1.7 million. Additionally, the Company and Koidu entered into an agreement to terminate the supply agreement between the parties, pursuant to which Laurelton Diamonds, Inc., a wholly owned subsidiary of the Company, had previously been required to purchase at fair market value certain diamonds recovered from the mine operated by Koidu that met Laurelton's quality standards. The Company also recorded an impairment charge, and a related valuation allowance, of $8.4 million during the fiscal year ended January 31, 2017 related to a separate financing arrangement with another diamond mining and exploration company. Management has not recorded any impairment charges on such loans in the three and nine months ended October 31, 2017 and 2016.

RECEIVABLES AND FINANCING ARRANGEMENTS

Receivables. The Company's accounts receivable, net primarily consists of amounts due from Credit Receivables (defined below), department store operators that host TIFFANY & CO. boutiques in their stores, third-party credit card issuers and wholesale customers. The Company maintains an allowance for doubtful accounts for estimated losses associated with the accounts receivable recorded on the balance sheet. The allowance is determined based on a combination of factors including, but not limited to, the length of time that the receivables are past due, management's knowledge of the customer, economic and market conditions and historical write-off experiences.

For the receivables associated with Tiffany & Co. credit cards ("Credit Card Receivables"), management uses various indicators to determine whether to extend credit to customers and the amount of credit. Such indicators include reviewing prior experience with the customer, including sales and collection history, and using applicants' credit reports and scores provided by credit rating agencies. Certain customers may be granted payment terms which permit purchases above a minimum amount to be paid for in equal monthly installments over a period not to exceed 12 months (together with Credit Card Receivables, "Credit Receivables"). Credit Receivables require minimum balance payments. An account is classified as overdue if a minimum balance payment has not been received within the allotted timeframe (generally 30 days), after which internal collection efforts commence. In order for the account to return to current status, full payment on all past due amounts needs to be received by the Company. For all Credit Receivables recorded on the balance sheet, once all internal collection efforts have been exhausted and management has reviewed the account, the account balance is written off and may be sent for external collection or legal action. At October 31, 2017 and 2016, the carrying amount of the Credit Receivables (recorded in accounts receivable, net) was $62.6 million and $71.2 million, of which 95% and 96% were considered current in the respective periods. The allowance for doubtful accounts for estimated losses associated with the Credit Receivables ($1.2 million at October 31, 2017 and $1.1 million at October 31, 2016) was determined based on the factors discussed above. Finance charges earned on Credit Card accounts are not significant.

Financing Arrangements. The Company has provided financing to diamond mining and exploration companies in order to obtain rights to purchase the mine's output. Management evaluates these financing arrangements for potential impairment by reviewing the parties' financial statements along with projections and business, operational and other economic factors on a periodic basis. At October 31, 2017 and 2016, the current portion of the carrying amount of financing arrangements including accrued interest was $1.5 million and $2.3 million, respectively, and was recorded in prepaid expenses and other current assets. At October 31, 2017 and 2016, the non-current portion of the net carrying amount of financing arrangements including accrued interest was $2.3 million and $19.7 million, respectively, and was included in other assets, net.

As of January 31, 2017, the Company had a $43.8 million loan receivable under a financing arrangement (the "Loan") with Koidu Limited (previously Koidu Holdings S.A.) ("Koidu"). The Company recorded an impairment charge of $4.2 million during the fiscal year ended January 31, 2017 related to the Loan, resulting in a net carrying amount of $1.7 million as of January 31, 2017 compared with $5.9 million as of October 31, 2016. During the three months ended April 30, 2017, the Company sold its interest in the Loan to Koidu's largest creditor for $1.7 million. Additionally, the Company and Koidu entered into an agreement to terminate the supply agreement between the parties, pursuant to which Laurelton Diamonds, Inc., a wholly owned subsidiary of the Company, had previously been required to purchase at fair market value certain diamonds recovered from the mine operated by Koidu that met Laurelton's quality standards.

The Company also recorded an impairment charge, and a related valuation allowance, of $8.4 million during the fiscal year ended January 31, 2017 related to a separate financing arrangement with another diamond mining and exploration company.

Management has not recorded any impairment charges on such loans in the three and nine months ended October 31, 2017 and 2016.