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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Revenue Recognition |  |  |
Total revenues | $ 1,182,115 | $ 1,089,286 | $ 960,951
Costs of goods sold | 751,521 | 697,634 | 637,450
Operating expenses | 322,820 | 335,744 | 290,209
Income from operations | 107,774 | 55,908 | 33,292
Interest expense and other expense, net | (21,610) |  |
Income tax provision | (21,368) | (65,981) | (4,675)
Net income (loss) | 64,796 | (29,127) | $ 21,076
Assets |  |  |
Accounts receivable, net | 238,440 | 210,744 |
Inventories | 273,711 | 313,552 |
Other assets | 752,713 |  |
Liabilities |  |  |
Current liabilities | 382,008 | 443,322 |
Other liabilities | 331,129 |  |
Stockholders' Equity |  |  |
Retained earnings | 399,541 | 334,745 |
Contract Assets |  |  |
Unbilled revenue | 19,287 | 1,617 |
Substantial non-current contract assets | 0 | 0 |
Contract Liabilities |  |  |
Advances from customers | 43,227 | 55,761 |
Deferred revenue - current | 33,641 | 28,899 |
Deferred revenue - long-term | 9,506 | $ 9,562 |
Remaining Performance Obligations |  |  |
Revenue remaining performance obligation | 143,500 |  |
Recognized revenue from contract liabilities | $ 74,600 |  |
Revenue, Practical Expedient, Financing Component [true false] | true |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01 |  |  |
Remaining Performance Obligations |  |  |
Remaining performance obligation expected timing of satisfaction period | 12 months |  |
Remaining performance obligation expected percentage recognized | 43.00% |  |
ASU 2014-09 | Balances without Adoption of ASC 606 |  |  |
Revenue Recognition |  |  |
Total revenues | $ 1,149,209 |  |
Costs of goods sold | 734,322 |  |
Operating expenses | 309,824 |  |
Income from operations | 105,063 |  |
Interest expense and other expense, net | (21,610) |  |
Income tax provision | (20,943) |  |
Net income (loss) | 62,510 |  |
Assets |  |  |
Accounts receivable, net | 218,941 |  |
Inventories | 290,980 |  |
Other assets | 753,138 |  |
Liabilities |  |  |
Current liabilities | 382,489 |  |
Other liabilities | 331,129 |  |
Stockholders' Equity |  |  |
Retained earnings | 397,255 |  |
ASU 2014-09 | Effect of Change |  |  |
Revenue Recognition |  |  |
Total revenues | 32,906 |  |
Costs of goods sold | 17,199 |  |
Operating expenses | 12,996 |  |
Income from operations | 2,711 |  |
Income tax provision | (425) |  |
Net income (loss) | 2,286 |  |
Assets |  |  |
Accounts receivable, net | 19,499 |  |
Inventories | (17,269) |  |
Other assets | (425) |  |
Liabilities |  |  |
Current liabilities | (481) |  |
Stockholders' Equity |  |  |
Retained earnings | 2,286 |  |
Contract Assets |  |  |
Unbilled revenue | 17,670 |  |
Contract Liabilities |  |  |
Advances from customers | (12,534) |  |
Deferred revenue - current | 4,742 |  |
Deferred revenue - long-term | $ (56) |  |
Percentage of of change in customer deposits and prepayments | (22.00%) |  |
Percentage of change deferred revenue current | 16.00% |  |
Percentage of change deferred revenue noncurrent | (1.00%) |  |
ASU 2014-09 | Effect of Change | Minimum |  |  |
Contract Assets |  |  |
Percentage of change in unbilled revenue | 100.00% |  |

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