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Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 138,659 | $ 140,429 | $ 114,373 | $ 103,541 | $ 75,106 | $ 77,149 | $ 67,661 | $ 62,021 | $ 497,002 | $ 281,937 | $ 252,965
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,854 | 6,748 | 5,524
Net income before provision for income taxes |  |  |  |  |  |  |  |  | 89,387 | 48,668 | 32,096
Capital expenditures |  |  |  |  |  |  |  |  | 10,449 | 9,262 | 6,176
Long-lived assets | 167,296 |  |  |  | 46,412 |  |  |  | 167,296 | 46,412 | 41,986
Total assets | 365,768 |  |  |  | 223,663 |  |  |  | 365,768 | 223,663 | 222,326
Malibu US |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 293,242 | 258,942 | 232,116
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,859 | 6,115 | 4,900
Net income before provision for income taxes |  |  |  |  |  |  |  |  | 68,015 | 46,927 | 31,674
Capital expenditures |  |  |  |  |  |  |  |  | 9,248 | 9,183 | 6,156
Long-lived assets | 39,388 |  |  |  | 36,089 |  |  |  | 39,388 | 36,089 | 31,446
Total assets | 327,181 |  |  |  | 222,252 |  |  |  | 327,181 | 222,252 | 222,613
Cobalt |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 180,315 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,386 | 0 | 0
Net income before provision for income taxes |  |  |  |  |  |  |  |  | 19,717 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 1,170 | 0 |
Long-lived assets | 118,512 |  |  |  | 0 |  |  |  | 118,512 | 0 | 0
Total assets | 157,616 |  |  |  | 0 |  |  |  | 157,616 | 0 | 0
Malibu Australia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 23,445 | 22,995 | 20,849
Depreciation and amortization |  |  |  |  |  |  |  |  | 609 | 633 | 624
Net income before provision for income taxes |  |  |  |  |  |  |  |  | 1,770 | 1,893 | 453
Capital expenditures |  |  |  |  |  |  |  |  | 31 | 79 | 20
Long-lived assets | 9,396 |  |  |  | 10,323 |  |  |  | 9,396 | 10,323 | 10,540
Total assets | 20,128 |  |  |  | 19,099 |  |  |  | 20,128 | 19,099 | 17,130
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 497,002 | 281,937 | 252,965
Operating Segments | Malibu US |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 302,115 | 267,552 | 239,689
Operating Segments | Cobalt |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 180,315 | 0 | 0
Operating Segments | Malibu Australia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 23,445 | 22,995 | 20,849
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (8,873) | (8,610) | (7,573)
Net income before provision for income taxes |  |  |  |  |  |  |  |  | (115) | (152) | (31)
Total assets | $ (139,157) |  |  |  | $ (17,688) |  |  |  | (139,157) | (17,688) | (17,417)
Intersegment Eliminations | Malibu US |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8,873 | 8,610 | 7,573
Intersegment Eliminations | Cobalt |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment Eliminations | Malibu Australia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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