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EARNINGS (LOSS) PER SHARE - Computation of basic and diluted earnings per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net Income	$ 77,796	$ 85,703	$ (51,459)	$ 74,925	$ 163,499	$ 23,466
Denominator:
Weighted-average shares used in computing basic net income (loss) per share (in shares)	71,225		77,654		72,499	78,895
Add—dilutive potential common shares:
Weighted-average shares used in computing diluted net income (loss) per share (in shares)	71,406		77,654		72,686	80,494
Net income (loss) per share of common stock:
Basic (in usd per share)	$ 1.09		$ (0.66)		$ 2.26	$ 0.30
Diluted (in usd per share)	$ 1.09		$ (0.66)		$ 2.25	$ 0.29
Stock options
Add—dilutive potential common shares:
Dilutive potential common shares (in shares)	102		0		110	1,522
Restricted stock units
Add—dilutive potential common shares:
Dilutive potential common shares (in shares)	79		0		77	77

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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