Revolving Credit Facilities and Mortgage Payable	6 Months Ended
Sep. 30, 2017
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 revolving credit facility agreement with JPMorgan Chase Bank, National Association as the administrative agent, Comerica and HSBC as co-syndication agents, and the lenders party thereto (as amended, the Second Amended and Restated Credit Agreement, or the Domestic Credit Facility). The Domestic Credit Facility is a five-year, $400,000 secured revolving credit facility which matures on November 13, 2019. 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 each quarter. As of September 30, 2017, the adjusted LIBOR and ABR rates were 2.48% and 4.50%, respectively. During the six months ended September 30, 2017, the Company made borrowings of $127,000 and repayments of $24,000 under the Domestic Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $103,000 under the Domestic Credit Facility. As a result, the available borrowings under the Domestic Credit Facility as of September 30, 2017 were $296,451, including outstanding letters of credit of $549. Subsequent to September 30, 2017, the Company borrowed $58,000 and made repayments of $5,000 under the Domestic Credit Facility. At November 9, 2017, the Company had an outstanding balance of $156,000 and available borrowings of $243,451 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 $45,054, and to remove the sublimit of CNY 50,000, or $7,509, 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 $15,018. The China Credit Facility is payable on demand and subject to annual review and renewal. 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 September 30, 2017 the total effective interest rate was 5.0%. During the six months ended September 30, 2017, the Company borrowed $21,027 and made no repayments under the China Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $21,027 and available borrowings of $24,027 under the China Credit Facility. Subsequent to September 30, 2017, the Company made no borrowings or repayments. At November 9, 2017, the Company had an outstanding balance of $21,027 and available borrowings of $24,027 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 (the Japan Credit Facility) that provides for an uncommitted revolving line of credit of up to JPY 5,500,000, or $48,864, 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, 2018. Interest is based on the Tokyo Interbank Offered Rate (TIBOR) plus 0.40%. As of September 30, 2017, TIBOR was 0.03% and the total effective interest rate was 0.43%. During the six months ended September 30, 2017, the Company made borrowings of $8,884 and no repayments under the Japan Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $8,884 under the Japan Credit Facility and available borrowings of $39,980. Subsequent to September 30, 2017, the Company made no borrowings but did make repayments of $2,664. At November 9, 2017, the Company had an outstanding balance of $6,220 and available borrowings of $42,644 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 September 30, 2017, the outstanding principal balance under the mortgage was $32,366, which includes $563 in short-term borrowings and $31,803 in mortgage payable in the condensed consolidated balance sheets. As of September 30, 2017, the Company was in compliance with all debt covenants under its borrowing arrangements and remains in compliance at November 9, 2017.

Revolving Credit Facilities and Mortgage Payable

Domestic Credit Facility

In November 2014, the Company amended its revolving credit facility agreement with JPMorgan Chase Bank, National Association as the administrative agent, Comerica and HSBC as co-syndication agents, and the lenders party thereto (as amended, the Second Amended and Restated Credit Agreement, or the Domestic Credit Facility). The Domestic Credit Facility is a five-year, $400,000 secured revolving credit facility which matures on November 13, 2019.

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 each quarter. As of September 30, 2017, the adjusted LIBOR and ABR rates were 2.48% and 4.50%, respectively.

During the six months ended September 30, 2017, the Company made borrowings of $127,000 and repayments of $24,000 under the Domestic Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $103,000 under the Domestic Credit Facility. As a result, the available borrowings under the Domestic Credit Facility as of September 30, 2017 were $296,451, including outstanding letters of credit of $549.

Subsequent to September 30, 2017, the Company borrowed $58,000 and made repayments of $5,000 under the Domestic Credit Facility. At November 9, 2017, the Company had an outstanding balance of $156,000 and available borrowings of $243,451 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 $45,054, and to remove the sublimit of CNY 50,000, or $7,509, 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 $15,018.

The China Credit Facility is payable on demand and subject to annual review and renewal. 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 September 30, 2017 the total effective interest rate was 5.0%.

During the six months ended September 30, 2017, the Company borrowed $21,027 and made no repayments under the China Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $21,027 and available borrowings of $24,027 under the China Credit Facility.

Subsequent to September 30, 2017, the Company made no borrowings or repayments. At November 9, 2017, the Company had an outstanding balance of $21,027 and available borrowings of $24,027 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 (the Japan Credit Facility) that provides for an uncommitted revolving line of credit of up to JPY 5,500,000, or $48,864, 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, 2018. Interest is based on the Tokyo Interbank Offered Rate (TIBOR) plus 0.40%. As of September 30, 2017, TIBOR was 0.03% and the total effective interest rate was 0.43%.

During the six months ended September 30, 2017, the Company made borrowings of $8,884 and no repayments under the Japan Credit Facility. As of September 30, 2017, the Company had an outstanding balance of $8,884 under the Japan Credit Facility and available borrowings of $39,980.

Subsequent to September 30, 2017, the Company made no borrowings but did make repayments of $2,664. At November 9, 2017, the Company had an outstanding balance of $6,220 and available borrowings of $42,644 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 September 30, 2017, the outstanding principal balance under the mortgage was $32,366, which includes $563 in short-term borrowings and $31,803 in mortgage payable in the condensed consolidated balance sheets.

As of September 30, 2017, the Company was in compliance with all debt covenants under its borrowing arrangements and remains in compliance at November 9, 2017.