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General - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Apr. 01, 2018 USD ($) | Mar. 31, 2015 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of reportable segments | segment | 5 |  |  |  |
Money market funds | $ 268,976 | $ 198,992 |  |  |
Return period for damaged goods | 1 year |  |  |  |
Sales and allowances period | 30 days |  |  |  |
Asset retirement obligation | $ 8,670 | 7,554 |  |  |
Impairment of intangible and other long-lived assets | 2,417 | 13,222 | $ 9,773 |  |
Research and development expense | 22,372 | 21,256 | 22,176 |  |
Marketing and advertising expense | 111,658 | 109,579 | 109,738 |  |
Prepaid advertising | $ 2,545 | 900 |  |  |
Employer matching contribution, percent of match | 50.00% |  |  |  |
Employer matching contribution, percent of employees' gross pay | 6.00% |  |  |  |
Cost recognized | $ 2,269 | 2,124 | 2,182 |  |
Non-qualified deferred compensation liability | 0 | 0 |  |  |
New ASU impact |  | 1,558 |  |  |
Deferred tax assets, net | 38,381 | 44,708 |  |  |
Accumulated other comprehensive loss | 12,983 | 26,451 |  |  |
Retained earnings | 785,871 | 819,589 |  |  |
Allowance for sales returns | (33,462) | (32,354) | (30,195) |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New ASU impact |  | 1,558 |  |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred tax assets, net |  | 1,365 |  |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New ASU impact |  | 1,365 |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accumulated other comprehensive loss | 0 |  |  |  |
Retained earnings | $ 0 |  |  |  |
Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life | 1 year |  |  |  |
Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Derivative contract term | 15 months |  |  |  |
Subsequent Event | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Refund liability |  |  |  | $ 20,848 |
Subsequent Event | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  |  | 1,000 |
Allowance for chargebacks |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for sales returns | $ (7,727) | (7,028) | (4,968) |  | $ (4,041)
Allowance for chargebacks | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for sales returns |  |  |  | $ 20,848 |
Retail Store Fixed Assets And Software |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impairment of intangible and other long-lived assets | $ 2,400 | $ 11,300 | $ 19,000 |  |

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