SHAREHOLDERS' EQUITY (Details)			3 Months Ended						6 Months Ended		12 Months Ended
	Apr. 27, 2020 $ / shares	Jan. 30, 2020 shares	Mar. 31, 2020 USD ($) senior_executive $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 $ / shares	Sep. 30, 2019 $ / shares	Aug. 01, 2018 USD ($)	Jan. 31, 2018 shares	Aug. 03, 2016 USD ($)
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares			$ 0.0750				$ 0.0725		$ 0.1500	$ 0.1450
Share-based compensation arrangement by share-based payment award, expiration period									10 years
Maximum percentage of exercise price at grant date fair value									100.00%
Number of shares available for grant (in shares)			1,057,505						1,057,505
Stock repurchase program, authorized amount | $												$ 50,000,000		$ 50,000,000
Stock repurchase program, remaining authorized repurchase amount | $			$ 57,955,000						$ 57,955,000
2006 Equity Incentive Plan
Class of Stock [Line Items]
Share based compensation arrangement by share based payment award equity instruments other than options additional grants in future (in shares)			0						0
Restricted Stock and Restricted Stock Units
Class of Stock [Line Items]
Award vesting period				3 years
Equity instruments other than options, grants in period (in shares)				216,523
Equity instruments other than options, granted in period, fair value | $				$ 4,705,000
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares				$ 21.73
Restricted Stock
Class of Stock [Line Items]
Shares paid for tax withholding for share based compensation (in shares)			261,223						340,775
Shares paid for tax withholding for share based compensation, value | $			$ 5,721,000						$ 7,409,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) | $ / shares			$ 21.90						$ 21.74
Restricted Stock | Minimum
Class of Stock [Line Items]
Award vesting period									3 years
Restricted Stock | Maximum
Class of Stock [Line Items]
Award vesting period									4 years
Restricted Stock | Employees, executives
Class of Stock [Line Items]
Equity instruments other than options, grants in period (in shares)			804,674
Restricted Stock | Employees, executives | Tranche One
Class of Stock [Line Items]
Award vesting period			34 months
Equity instruments other than options, grants in period (in shares)			99,772
Equity instruments other than options, granted in period, fair value | $			$ 2,200,000
Number of executive officers granted shares | senior_executive			7
Restricted Stock | Employees, executives | Tranche Two
Class of Stock [Line Items]
Award vesting period			4 years
Equity instruments other than options, grants in period (in shares)			660,000
Equity instruments other than options, granted in period, fair value | $			$ 9,534,000
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares			$ 14.45
Number of executive officers granted shares | senior_executive			2
Award post-vesting holding period			2 years
Restricted Stock | Employees, executives | Minimum | Tranche Two
Class of Stock [Line Items]
Amount of shares that can vest based on attainment of minimum performance condition (in shares)			480,000						480,000
Restricted Stock | Employees, executives | Maximum | Tranche Two
Class of Stock [Line Items]
Amount of shares that can vest based on attainment of minimum performance condition (in shares)			660,000						660,000
Restricted Stock | Non-employees, directors
Class of Stock [Line Items]
Award vesting period			3 years
Equity instruments other than options, granted in period, fair value | $			$ 990,000
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares			$ 22.05
Restricted Stock | Non-employees, directors | Tranche One
Class of Stock [Line Items]
Equity instruments other than options, grants in period (in shares)			44,902
Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares			$ 22.05
Restricted Stock Units
Class of Stock [Line Items]
Shares paid for tax withholding for share based compensation (in shares)									3,307
Shares paid for tax withholding for share based compensation, value | $									$ 70,000
Shares paid for tax withholding for share based compensation, value per share (in dollars per share) | $ / shares									$ 21.22
Incentive Plan
Class of Stock [Line Items]
Number of shares authorized for award (in shares)			5,050,000						5,050,000				1,000,000
Number of additional shares authorized for award (in shares)		1,700,000
Incentive Plan | Incentive Stock Options
Class of Stock [Line Items]
Number of shares authorized for award (in shares)			600,000						600,000
Quarterly Dividend
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares			$ 0.075	$ 0.075	$ 0.0725	$ 0.0725	$ 0.0725	$ 0.0725	$ 0.15		$ 0.29
Quarterly Dividend | Subsequent Event
Class of Stock [Line Items]
Dividends declared, amount per share (in dollars per share) | $ / shares	$ 0.075