Revolving Credit Facilities and Mortgage Payable	12 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Revolving Credit Facilities and Mortgage Payable	Revolving Credit Facilities and Mortgage Payable Domestic Credit Facility In November 2014, the Company amended its Second Amended and Restated Credit Agreement with JPMorgan Chase Bank, National Association (JPMorgan) as the administrative agent, Comerica and HSBC as co-syndication agents, and the lenders party thereto (as amended, Second Amended and Restated Credit Agreement). The Second Amended and Restated Credit Agreement provides for a five-year, $400,000 secured revolving credit facility (Domestic Credit Facility) which contains a $75,000 sublimit for the issuance of letters of credit and a $5,000 sublimit for swing line loans, which matures on November 13, 2019. In August 2015, the Company entered into an additional amendment to the Second Amended and Restated Credit Agreement to add certain foreign subsidiaries as borrowers, and in October 2016, further amended the Second Amended and Restated Credit Agreement to allow increased borrowing under its China Credit Facility (as defined below). In addition, in November 2017, the Company further amended the Second Amended and Restated Credit Agreement to revise the definition of "change in control". Subject to customary conditions and the approval of any lender whose commitment would be increased, the Company has the option to increase the maximum principal amount available under the Domestic Credit Facility by up to an additional $200,000, resulting in a maximum available principal amount of $600,000. No lender under the Domestic Credit Facility has committed at this time or is obligated to provide any such increase in the commitments. In addition to allowing borrowings in US dollars, the Domestic Credit Facility provides a $150,000 sublimit for borrowings in Euros, British Pounds and any other currency that is subsequently approved by JPMorgan, each lender and the issuing bank. At the Company's election, interest under the Domestic Credit Facility is tied to the adjusted London Interbank Offered Rate (LIBOR) or the Alternative Base Rate (ABR), and is variable based on the Company's total adjusted leverage ratio. The initial adjusted LIBOR rate is equal to the effective LIBOR rate for the interest period elected, plus 1.25% per annum, or at the ABR plus 0.25% per annum, and thereafter the interest rate will fluctuate between adjusted LIBOR plus 1.25% per annum and adjusted LIBOR plus 2.00% per annum (or between the ABR plus 0.25% per annum and the ABR plus 1.25% per annum), based upon the Company's total adjusted leverage ratio at such time. The ABR is defined in the Second Amended and Restated Credit Agreement as the rate per annum equal to the greater of (1) the prime rate, (2) the federal funds effective rate plus 0.50% and (3) the adjusted LIBOR rate for a one-month interest period plus 1.00%. As of March 31, 2018, the adjusted LIBOR and ABR rates were 3.13% and 5.00%, respectively. In addition, the Company is initially required to pay commitment fees of 0.175% per annum on the daily amount of the available borrowings under the Domestic Credit Facility, and thereafter the fee rate will fluctuate between 0.175% and 0.30% per annum, based upon the Company's total adjusted leverage ratio. The Company's obligations under the Second Amended and Restated Credit Agreement are guaranteed by the Company's existing and future wholly-owned domestic subsidiaries (other than certain immaterial subsidiaries, foreign subsidiaries, foreign subsidiary holding companies and specified excluded subsidiaries) (Guarantors), and are secured by a first-priority security interest in substantially all of the assets of the Company and the Guarantors, including all or a portion of the equity interests of certain of the Company's domestic and first-tier foreign subsidiaries. The Domestic Credit Facility is governed by financial covenants which include: the total adjusted leverage ratio must not be greater than 3.25 to 1.00; the sum of the consolidated annual earnings before interest, taxes, depreciation, and amortization and annual rental expense, divided by the sum of the annual interest expense and the annual rental expense must be greater than 2.25 to 1.00; and other customary limitations. The Domestic Credit Facility is governed by certain other covenants which include: the maximum amount paid for capital expenditures may not exceed $110,000 per year if the total adjusted leverage ratio is equal to or exceeds 2.75 to 1.00; the maximum additional unsecured debt may not exceed $200,000; the Company may not have aggregate Employee Retirement Income Security Act of 1974 events that are considered materially adverse; the Company may not have a change of control (as defined in the Second Amended and Restated Credit Agreement); and no restrictions on cash dividends, stock repurchases or acquisitions may be made, provided that no event of default has occurred. During the year ended March 31, 2018, the Company made borrowings and repayments of $185,000 under the Domestic Credit Facility. As of March 31, 2018, the Company had no outstanding balance under the Domestic Credit Facility. As a result, the available borrowings under the Domestic Credit Facility as of March 31, 2018 were $399,451, including outstanding letters of credit of $549. Any amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets. As of March 31, 2018, the Company had a remaining balance of approximately $600 in deferred financing costs related to previous amendments to the Second Amended and Restated Credit Agreement, which includes $400 and $200 recorded in other current assets and long-term other assets, respectively, in the consolidated balance sheets. Deferred financing costs are being amortized ratably over the remaining term of the Second Amended and Restated Credit Agreement. Subsequent to March 31, 2018, the Company made no additional borrowings under the Domestic Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $399,451 under the Domestic Credit Facility. China Credit Facility In August 2013, Deckers (Beijing) Trading Co., LTD (DBTC), a wholly-owned subsidiary of the Company, entered into a revolving credit facility agreement in China (as amended, the China Credit Facility) that provided for an uncommitted revolving line of credit. In October 2016, the China Credit Facility was amended to include an increase in the uncommitted revolving line of credit of up to CNY 300,000, or $47,760, and to remove the sublimit of CNY 50,000, or $7,960, for the Company's wholly-owned subsidiary, Deckers Footwear (Shanghai) Co., LTD (DFSC). In March 2017, the China Credit Facility was amended to remove DFSC, leaving DBTC as the only remaining borrower, and to add an overdraft facility sublimit of CNY 100,000, or $15,920. The China Credit Facility is payable on demand and subject to annual review and renewal with a defined aggregate period of borrowing of up to 12 months. The obligations under the China Credit Facility are guaranteed by the Company for 108.5% of the facility amount in US dollars. Interest is based on 115.0% multiplied by the People’s Bank of China market rate, which was 4.35%. As of March 31, 2018, the total effective interest rate was 5.00%. During the year ended March 31, 2018, the Company made borrowings and repayments of $21,026 under the China Credit Facility. As of March 31, 2018, the Company had no outstanding balance and available borrowings of $47,760 under the China Credit Facility. Amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets. Subsequent to March 31, 2018, the Company made no additional borrowings under the China Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $47,760 under the China Credit Facility. Japan Credit Facility In March 2016, Deckers Japan, G.K., a wholly-owned subsidiary of the Company, entered into a revolving credit facility agreement in Japan (as amended, the Japan Credit Facility) that provides for an uncommitted revolving line of credit of up to JPY 5,500,000, or $51,700, for a maximum term of six months for each draw on the facility. The Japan Credit Facility renews annually, and is guaranteed by the Company. The Company has renewed the Japan Credit Facility through January 31, 2019 under the terms of the original agreement. Interest is based on the Tokyo Interbank Offered Rate (TIBOR) for three months plus 0.40%. As of March 31, 2018, TIBOR for three months was 0.06% and the total effective interest rate was 0.46%. The Japan Credit Facility has customary covenants including a restriction against having losses for two consecutive years, maintaining an interest coverage ratio greater than 1.00 to 1.00, and maintaining higher assets than liabilities. During the year ended March 31, 2018, the Company made borrowings and repayments of $8,884 under the Japan Credit Facility. As of March 31, 2018, the Company had no outstanding balance under the Japan Credit Facility and available borrowings of $51,700. Amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets. Subsequent to March 31, 2018, the Company made no additional borrowings under the Japan Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $51,700 under the Japan Credit Facility. Mortgage In July 2014, the Company obtained a mortgage secured by the property on which its corporate headquarters is located for approximately $33,900. As of March 31, 2018, the outstanding principal balance under the mortgage was $32,082, which includes $578 in short-term borrowings and $31,504 in mortgage payable in the consolidated balance sheets. The mortgage has a fixed interest rate of 4.928%. Payments include interest and principal in an amount that amortizes the principal balance over a 30-year period; however, the loan will mature and have a balloon payment, due on July 1, 2029 of approximately $23,700, in addition to any then-outstanding balance. Minimum principal payments over the next five years are $3,195. In December 2014, the mortgage financial covenants were amended to be consistent with the financial covenants that govern the Domestic Credit Facility, as discussed above. Debt Covenants As of March 31, 2018, the Company was in compliance with all debt covenants under the various revolving credit facilities discussed above. The borrowing and repayment amounts disclosed above for the China Credit Facility and Japan Credit Facility have been translated into US dollars using average currency exchange rates in effect as of the borrowing and repayment dates. The outstanding balance or available borrowing amounts disclosed above for the China Credit Facility and Japan Credit Facility have been translated into US dollars using spot rates in effect as of March 31, 2018. As a result, there are differences between the debt balances within this footnote disclosure and those presented in the consolidated statements of cash flows due to foreign currency exchange rates.

Revolving Credit Facilities and Mortgage Payable

Domestic Credit Facility

In November 2014, the Company amended its Second Amended and Restated Credit Agreement with JPMorgan Chase Bank, National Association (JPMorgan) as the administrative agent, Comerica and HSBC as co-syndication agents, and the lenders party thereto (as amended, Second Amended and Restated Credit Agreement). The Second Amended and Restated Credit Agreement provides for a five-year, $400,000 secured revolving credit facility (Domestic Credit Facility) which contains a $75,000 sublimit for the issuance of letters of credit and a $5,000 sublimit for swing line loans, which matures on November 13, 2019.

In August 2015, the Company entered into an additional amendment to the Second Amended and Restated Credit Agreement to add certain foreign subsidiaries as borrowers, and in October 2016, further amended the Second Amended and Restated Credit Agreement to allow increased borrowing under its China Credit Facility (as defined below). In addition, in November 2017, the Company further amended the Second Amended and Restated Credit Agreement to revise the definition of "change in control". Subject to customary conditions and the approval of any lender whose commitment would be increased, the Company has the option to increase the maximum principal amount available under the Domestic Credit Facility by up to an additional $200,000, resulting in a maximum available principal amount of $600,000. No lender under the Domestic Credit Facility has committed at this time or is obligated to provide any such increase in the commitments. In addition to allowing borrowings in US dollars, the Domestic Credit Facility provides a $150,000 sublimit for borrowings in Euros, British Pounds and any other currency that is subsequently approved by JPMorgan, each lender and the issuing bank.

At the Company's election, interest under the Domestic Credit Facility is tied to the adjusted London Interbank Offered Rate (LIBOR) or the Alternative Base Rate (ABR), and is variable based on the Company's total adjusted leverage ratio. The initial adjusted LIBOR rate is equal to the effective LIBOR rate for the interest period elected, plus 1.25% per annum, or at the ABR plus 0.25% per annum, and thereafter the interest rate will fluctuate between adjusted LIBOR plus 1.25% per annum and adjusted LIBOR plus 2.00% per annum (or between the ABR plus 0.25% per annum and the ABR plus 1.25% per annum), based upon the Company's total adjusted leverage ratio at such time. The ABR is defined in the Second Amended and Restated Credit Agreement as the rate per annum equal to the greater of (1) the prime rate, (2) the federal funds effective rate plus 0.50% and (3) the adjusted LIBOR rate for a one-month interest period plus 1.00%. As of March 31, 2018, the adjusted LIBOR and ABR rates were 3.13% and 5.00%, respectively.

In addition, the Company is initially required to pay commitment fees of 0.175% per annum on the daily amount of the available borrowings under the Domestic Credit Facility, and thereafter the fee rate will fluctuate between 0.175% and 0.30% per annum, based upon the Company's total adjusted leverage ratio.

The Company's obligations under the Second Amended and Restated Credit Agreement are guaranteed by the Company's existing and future wholly-owned domestic subsidiaries (other than certain immaterial subsidiaries, foreign subsidiaries, foreign subsidiary holding companies and specified excluded subsidiaries) (Guarantors), and are secured by a first-priority security interest in substantially all of the assets of the Company and the Guarantors, including all or a portion of the equity interests of certain of the Company's domestic and first-tier foreign subsidiaries.

The Domestic Credit Facility is governed by financial covenants which include: the total adjusted leverage ratio must not be greater than 3.25 to 1.00; the sum of the consolidated annual earnings before interest, taxes, depreciation, and amortization and annual rental expense, divided by the sum of the annual interest expense and the annual rental expense must be greater than 2.25 to 1.00; and other customary limitations. The Domestic Credit Facility is governed by certain other covenants which include: the maximum amount paid for capital expenditures may not exceed $110,000 per year if the total adjusted leverage ratio is equal to or exceeds 2.75 to 1.00; the maximum additional unsecured debt may not exceed $200,000; the Company may not have aggregate Employee Retirement Income Security Act of 1974 events that are considered materially adverse; the Company may not have a change of control (as defined in the Second Amended and Restated Credit Agreement); and no restrictions on cash dividends, stock repurchases or acquisitions may be made, provided that no event of default has occurred.

During the year ended March 31, 2018, the Company made borrowings and repayments of $185,000 under the Domestic Credit Facility. As of March 31, 2018, the Company had no outstanding balance under the Domestic Credit Facility. As a result, the available borrowings under the Domestic Credit Facility as of March 31, 2018 were $399,451, including outstanding letters of credit of $549. Any amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets. As of March 31, 2018, the Company had a remaining balance of approximately $600 in deferred financing costs related to previous amendments to the Second Amended and Restated Credit Agreement, which includes $400 and $200 recorded in other current assets and long-term other assets, respectively, in the consolidated balance sheets. Deferred financing costs are being amortized ratably over the remaining term of the Second Amended and Restated Credit Agreement.

Subsequent to March 31, 2018, the Company made no additional borrowings under the Domestic Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $399,451 under the Domestic Credit Facility.

China Credit Facility

In August 2013, Deckers (Beijing) Trading Co., LTD (DBTC), a wholly-owned subsidiary of the Company, entered into a revolving credit facility agreement in China (as amended, the China Credit Facility) that provided for an uncommitted revolving line of credit. In October 2016, the China Credit Facility was amended to include an increase in the uncommitted revolving line of credit of up to CNY 300,000, or $47,760, and to remove the sublimit of CNY 50,000, or $7,960, for the Company's wholly-owned subsidiary, Deckers Footwear (Shanghai) Co., LTD (DFSC). In March 2017, the China Credit Facility was amended to remove DFSC, leaving DBTC as the only remaining borrower, and to add an overdraft facility sublimit of CNY 100,000, or $15,920.

The China Credit Facility is payable on demand and subject to annual review and renewal with a defined aggregate period of borrowing of up to 12 months. The obligations under the China Credit Facility are guaranteed by the Company for 108.5% of the facility amount in US dollars. Interest is based on 115.0% multiplied by the People’s Bank of China market rate, which was 4.35%. As of March 31, 2018, the total effective interest rate was 5.00%.

During the year ended March 31, 2018, the Company made borrowings and repayments of $21,026 under the China Credit Facility. As of March 31, 2018, the Company had no outstanding balance and available borrowings of $47,760 under the China Credit Facility. Amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets.

Subsequent to March 31, 2018, the Company made no additional borrowings under the China Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $47,760 under the China Credit Facility.

Japan Credit Facility

In March 2016, Deckers Japan, G.K., a wholly-owned subsidiary of the Company, entered into a revolving credit facility agreement in Japan (as amended, the Japan Credit Facility) that provides for an uncommitted revolving line of credit of up to JPY 5,500,000, or $51,700, for a maximum term of six months for each draw on the facility. The Japan Credit Facility renews annually, and is guaranteed by the Company. The Company has renewed the Japan Credit Facility through January 31, 2019 under the terms of the original agreement. Interest is based on the Tokyo Interbank Offered Rate (TIBOR) for three months plus 0.40%. As of March 31, 2018, TIBOR for three months was 0.06% and the total effective interest rate was 0.46%. The Japan Credit Facility has customary covenants including a restriction against having losses for two consecutive years, maintaining an interest coverage ratio greater than 1.00 to 1.00, and maintaining higher assets than liabilities.

During the year ended March 31, 2018, the Company made borrowings and repayments of $8,884 under the Japan Credit Facility. As of March 31, 2018, the Company had no outstanding balance under the Japan Credit Facility and available borrowings of $51,700. Amounts outstanding are recorded in short-term borrowings in the consolidated balance sheets.

Subsequent to March 31, 2018, the Company made no additional borrowings under the Japan Credit Facility. At May 25, 2018, the Company had no outstanding balance and available borrowings of $51,700 under the Japan Credit Facility.

Mortgage

In July 2014, the Company obtained a mortgage secured by the property on which its corporate headquarters is located for approximately $33,900. As of March 31, 2018, the outstanding principal balance under the mortgage was $32,082, which includes $578 in short-term borrowings and $31,504 in mortgage payable in the consolidated balance sheets. The mortgage has a fixed interest rate of 4.928%. Payments include interest and principal in an amount that amortizes the principal balance over a 30-year period; however, the loan will mature and have a balloon payment, due on July 1, 2029 of approximately $23,700, in addition to any then-outstanding balance. Minimum principal payments over the next five years are $3,195. In December 2014, the mortgage financial covenants were amended to be consistent with the financial covenants that govern the Domestic Credit Facility, as discussed above.

Debt Covenants

As of March 31, 2018, the Company was in compliance with all debt covenants under the various revolving credit facilities discussed above.

The borrowing and repayment amounts disclosed above for the China Credit Facility and Japan Credit Facility have been translated into US dollars using average currency exchange rates in effect as of the borrowing and repayment dates. The outstanding balance or available borrowing amounts disclosed above for the China Credit Facility and Japan Credit Facility have been translated into US dollars using spot rates in effect as of March 31, 2018. As a result, there are differences between the debt balances within this footnote disclosure and those presented in the consolidated statements of cash flows due to foreign currency exchange rates.