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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Operations (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Consolidated Statement of Operations [Abstract]          
Net sales $ 124,113,000 $ 102,878,000 $ 343,720,000 $ 307,834,000  
Cost of goods sold 102,952,000 76,817,000 280,496,000 229,894,000  
Gross profit 21,161,000 26,061,000 63,224,000 77,940,000  
Operating expenses [Abstract]          
General and administrative 12,331,000 11,915,000 33,419,000 26,418,000  
Sales and marketing 5,149,000 4,048,000 14,078,000 10,899,000  
Research and development 2,054,000 1,678,000 5,574,000 3,920,000  
Total operating expenses 19,534,000 17,641,000 53,071,000 41,237,000  
Operating income 1,627,000 8,420,000 10,153,000 36,703,000  
Interest expense, net 5,764,000 3,953,000 16,538,000 10,789,000  
(Loss) income before income tax (benefit) expense (4,137,000) 4,467,000 (6,385,000) 25,914,000  
Income tax expense (benefit) (1,035,000) 6,994,000 (1,301,000) 15,026,000  
Net (loss) income $ (3,102,000) $ (2,527,000) $ (5,084,000) $ 10,888,000  
Basic net income (loss) per share (in dollars per share) $ (0.16) $ (0.13) $ (0.27) $ 0.58  
Diluted net income (loss) per share (in dollars per share) $ (0.16) $ (0.13) $ (0.27) $ 0.56  
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member]          
Consolidated Statement of Operations [Abstract]          
Net sales   $ 101,713,000   $ 306,805,000 $ 426,991,000
Cost of goods sold   75,833,000   229,669,000 320,449,000
Gross profit   25,880,000   77,136,000 106,542,000
Operating expenses [Abstract]          
General and administrative   11,915,000   26,418,000 35,477,000
Sales and marketing   4,048,000   10,899,000 15,030,000
Research and development   1,678,000   3,920,000 5,692,000
Total operating expenses   17,641,000   41,237,000 56,199,000
Operating income   8,239,000   35,899,000 50,343,000
Interest expense, net   3,953,000   10,789,000 15,445,000
(Loss) income before income tax (benefit) expense   4,286,000   25,110,000 34,898,000
Income tax expense (benefit)   6,936,000   14,742,000 16,072,000
Net (loss) income   $ (2,650,000)   $ 10,368,000 $ 18,826,000
Basic net income (loss) per share (in dollars per share)   $ (0.14)   $ 0.55 $ 1.00
Diluted net income (loss) per share (in dollars per share)   $ (0.14)   $ 0.53 $ 0.96
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member]          
Consolidated Statement of Operations [Abstract]          
Net sales   $ 100,127,000   $ 306,964,000 $ 428,072,000
Cost of goods sold   77,583,000   231,419,000 322,199,000
Gross profit   22,544,000   75,545,000 105,873,000
Operating expenses [Abstract]          
General and administrative   11,915,000   26,717,000 35,527,000
Sales and marketing   4,048,000   10,899,000 15,030,000
Research and development   1,678,000   3,920,000 5,692,000
Total operating expenses   17,641,000   41,536,000 56,249,000
Operating income   4,903,000   34,009,000 49,624,000
Interest expense, net   3,953,000   10,789,000 15,445,000
(Loss) income before income tax (benefit) expense   950,000   23,220,000 34,179,000
Income tax expense (benefit)   7,756,000   16,099,000 17,863,000
Net (loss) income   $ (6,806,000)   $ 7,121,000 $ 16,316,000
Basic net income (loss) per share (in dollars per share)   $ (0.36)   $ 0.38 $ 0.87
Diluted net income (loss) per share (in dollars per share)   $ (0.36)   $ 0.37 $ 0.84
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member]          
Consolidated Statement of Operations [Abstract]          
Net sales   $ 1,586,000   $ (159,000) $ (1,081,000)
Cost of goods sold   (1,750,000)   (1,750,000) (1,750,000)
Gross profit   3,336,000   1,591,000 669,000
Operating expenses [Abstract]          
General and administrative   0   (299,000) (50,000)
Sales and marketing   0   0 0
Research and development   0   0 0
Total operating expenses   0   (299,000) (50,000)
Operating income   3,336,000   1,890,000 719,000
Interest expense, net   0   0 0
(Loss) income before income tax (benefit) expense   3,336,000   1,890,000 719,000
Income tax expense (benefit)   (820,000)   (1,357,000) (1,791,000)
Net (loss) income   $ 4,156,000   $ 3,247,000 $ 2,510,000
Basic net income (loss) per share (in dollars per share)   $ 0.22   $ 0.17 $ 0.13
Diluted net income (loss) per share (in dollars per share)   $ 0.22   $ 0.17 $ 0.13