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COMMON STOCK AND TREASURY STOCK - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2014 | Sep. 30, 2014 | Feb. 28, 2015 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 03, 2017 | Aug. 03, 2016 | May 04, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 500,000,000 |  | 500,000,000 |  | 500,000,000 | 500,000,000 |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 80,275,965 |  | 81,667,129 |  | 80,275,965 | 81,667,129 |  |  |  |
Treasury stock, shares retired (in shares) |  |  | 44,768,739 |  |  |  |  |  |  |  |  |  |
Treasury stock, value of retired stock |  |  | $ 138,900,000 |  |  |  |  |  |  | $ 0 |  |  |
Dividend declared (in dollars per share) |  | $ 0.17 |  |  |  |  |  | $ 0 | $ 0 | $ 0.17 |  |  |
Dividend paid | $ 15,000,000 |  |  |  |  |  |  | $ 0 | $ 0 | $ 15,020,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares retired (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |  |
Stock repurchase program one |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  |  |  | 1,309,606 |  |  |  |  |  |  |
Value of total number of shares purchased |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Stock repurchase cost incurred but not yet paid |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  |
Stock repurchase program one | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Average price paid per share (in dollars per share) |  |  |  |  |  | $ 38.18 |  |  |  |  |  |  |
Stock repurchase program two |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  |  | 1,014,956 |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) |  |  |  |  | $ 49.26 |  |  |  |  |  |  |  |
Value of total number of shares purchased |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Stock repurchase program two | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Stock repurchase program three |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  | 50,000 | 917,455 |  |  |  |  |  |  |  |
Value of total number of shares purchased |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |
Stock repurchase cost incurred but not yet paid |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |
Stock repurchase program three | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  | $ 46,300,000 |  | 46,300,000 |  |  |  | $ 50,000,000 |  |
Average price paid per share (in dollars per share) |  |  |  | $ 49.55 | $ 50.43 |  |  |  |  |  |  |  |
Remaining authorized repurchase amount |  |  |  |  | $ 1,300,000 |  | $ 1,300,000 |  |  |  |  |  |

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