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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Reserves for sales returns and allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, balance at beginning of year $ 9,429 $ 8,823 $ 6,716
Amounts charged to expense 62,953 41,173 41,217
Deductions (63,569) (41,417) (40,085)
Other 0 850 975
Valuation allowances and reserves, balance at end of year 8,813 9,429 8,823
Reserves for trade promotions      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, balance at beginning of year 15,193 12,641 9,932
Amounts charged to expense 78,669 69,475 62,331
Deductions (82,427) (69,713) (62,409)
Other 0 2,790 2,787
Valuation allowances and reserves, balance at end of year 11,435 15,193 12,641
Reserves for consumer coupon redemptions      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, balance at beginning of year 4,614 4,323 1,672
Amounts charged to expense 7,283 7,616 6,235
Deductions (9,252) (7,745) (5,637)
Other 0 420 2,053
Valuation allowances and reserves, balance at end of year 2,645 4,614 4,323
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, balance at beginning of year 1,352 815 1,277
Amounts charged to expense 187 177 (276)
Deductions (336) 360 (186)
Other 0 0 0
Valuation allowances and reserves, balance at end of year 1,203 1,352 815
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, balance at beginning of year 3,437 0  
Amounts charged to expense 0 0  
Deductions 0 0  
Other (2,828) 3,437  
Valuation allowances and reserves, balance at end of year $ 609 $ 3,437 $ 0