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STOCK-BASED COMPENSATION - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) item $ / shares shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised | $	$ 500	$ 1,800
Total pre-tax unrecognized compensation costs related to non-vested awards | $	$ 30,900
Total pre-tax unrecognized compensation costs related to non-vested awards expected to be recognized, years	2 years 8 months 12 days
Total fair value of options and Restricted Stock Units vested | $	$ 12,100	11,100
Share-based Payment Arrangement, Amount Capitalized | $	$ 0	$ 0	$ 0
Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangements plans | item	2
Weighted average estimated grant date fair values, for options granted at market price, per share | $ / shares	$ 16.98	$ 20.96
Common Stock, Capital Shares Reserved for Future Issuance | shares	6,735,482
Stock Incentive Plans | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options (in years)	10 years
Vesting Period (in years)	5 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 43.39	$ 49.03
Restricted Stock Units Outstanding, Shares Granted | shares	370,280
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options (in years)	3 years
Restricted Stock Units Outstanding, Shares Granted | shares	135,660
Non-Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options (in years)	3 years
Restricted Stock Units Outstanding, Shares Granted | shares	234,620
Non-Performance Based Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options (in years)	1 year
Non-Performance Based Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options (in years)	4 years

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Aggregate number of common shares reserved for future issuance.

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