CAPITAL STOCK - NARRATIVE (Details) $ / shares in Units, $ in Thousands					1 Months Ended				12 Months Ended
	Mar. 05, 2021 USD ($) $ / shares shares	Apr. 14, 2020 shares	Apr. 01, 2020 USD ($)	Mar. 30, 2020 USD ($) $ / shares shares	Apr. 30, 2020 shares	May 31, 2018 shares	May 31, 2016 shares	May 31, 2012 shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	May 31, 2003 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend rate (as a percent)										0.00%	0.00%
Reverse stock split conversion ratio									10
Fair value of stock options granted during period | $										$ 1,600	$ 2,400
Weighted average grant date fair value | $ / shares										$ 82.77	$ 28.66
Intrinsic value of options exercised | $									$ 7,200	$ 9,900	$ 5,000
Proceeds from stock options exercised | $									$ 2,200	$ 3,300	$ 3,400
Performance shares not meeting performance targets (in shares)									75,000
Unrecognized compensation costs, not probable | $									$ 1,900
Weighted average purchase price of shares purchased | $ / shares									$ 14.43	$ 29.56	$ 16.19
Preferred stock, shares issued (in shares)									0	0
Preferred stock, par value (in dollars per share) | $ / shares									$ 0.01	$ 0.01
Payments of stock issuance costs | $									$ 0	$ 314	$ 214
Risk-free interest rate (as a percent)										0.98%	3.64%
Expected volatility (as a percent)										47.00%	46.00%
Equity Offering, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in dollars per share) | $ / shares	$ 186.00
Sale of stock, number of shares issued in transaction (in shares)	940,860
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Sale of stock, conversion received on transaction | $	$ 164,200
Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in dollars per share) | $ / shares	$ 186.00
Authorized shares (in shares)	141,129
Over allotment option period	30 days
Series X Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion to common stock (in shares)		122,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued									0	0
Conversion to common stock (in shares)		1,508,964
Common stock, par value (in dollars per share) | $ / shares									$ 0.01	$ 0.01
Scil Animal Care Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price in cash | $			$ 110,290	$ 111,000
Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued (in shares)				122,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.01
Sale of stock, price per share (in dollars per share) | $ / shares				$ 1,000
Sale of stock, consideration received per transaction | $				$ 122,000
Payments of stock issuance costs | $				$ 200
Convertible preferred stock, shares issuable upon conversion (in shares)				12.4
Preferred stock, convertible, conversion price (in dollars per share) | $ / shares				$ 80.85
Conversion to common stock (in shares)											(122,000)
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of unrecognized compensation expense									1 year 8 months 12 days
Performance shares not meeting performance targets (in shares)									222,000
Unrecognized compensation costs, not probable | $									$ 33,500
Unrecognized compensation cost | $									$ 16,100
Weighted average purchase price of shares purchased | $ / shares									$ 115.91
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									1 year
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)									7 years
Stock options and restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised | $									$ 2,400
Total unrecognized compensation expense related to outstanding stock options | $									$ 800
Period for recognition of unrecognized compensation expense									1 year 1 month 6 days
Intrinsic value of options outstanding | $									$ 2,400
Granted at Market (in dollars per share) | $ / shares									$ 0
Forfeitures in period (in shares)									7,416
Options outstanding (in shares)									340,038	420,202
Weighted Average Outstanding Price (in dollars per share) | $ / shares									$ 70.84	$ 64.06
Exercises in period (in shares)									72,457
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of fair value for options granted									100.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options granted during period | $										$ 2,600	$ 6,000
Weighted average grant date fair value | $ / shares										$ 75.62	$ 25.04
Intrinsic value of options exercised | $									$ 300
Proceeds from stock options exercised | $									$ 100
Period for recognition of unrecognized compensation expense									8 months 12 days
Unrecognized compensation cost | $									$ 400
Weighted average purchase price of shares purchased | $ / shares									$ 0
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)									200,000
Offering period									6 months
Shares issued (in shares)									12,188	5,437	3,859
Percentage of base pay									10.00%
Discount from market price, offering date									85.00%
Employee Stock | Previous ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)											6,210
Share Purchase Plan 1997
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of share to be repurchased					300,000	250,000	500,000	250,000
Number of shares authorized to be repurchased annually								45,000
Remaining number of shares authorized to be repurchased									132,024
Common stock, shares issued									21,484
Share Purchase Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of share to be repurchased								250,000
Number of shares authorized (in shares)												239,050
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of unrecognized compensation expense									2 years
Performance shares not meeting performance targets (in shares)									3,000
Unrecognized compensation costs, not probable | $									$ 600
Unrecognized compensation cost | $									$ 2,100
Weighted average purchase price of shares purchased | $ / shares									$ 100.97	$ 207.24	$ 87.29
Restricted stock vested, fair value | $									$ 15,800	$ 5,600	$ 5,000