STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($)				9 Months Ended
	Feb. 16, 2018	Jan. 02, 2018	Jul. 26, 2017	Sep. 30, 2018	May 24, 2017
Stock options, Shares
Granted (in shares)	13,163	58,010	402,694
Stock options, Weighted Average Exercise Price
Granted (in dollars per share)	$ 378.95	$ 340.25	$ 183.80
Stock options, Grant Date Fair Value Valuation
Share price				$ 230.10	$ 156.70
Grant date fair value				$ 161.58
Aggregate stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)				1,863,739
Granted (in shares)				58,901
Exercised (in shares)				(971,211)
Forfeited (in shares)				(6,425)
Expired (in shares)				0
Outstanding at the end of the period (in shares)				945,004
Options exercisable at the end of the period (in shares)				772,651
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 30.70
Granted (in dollars per share)				317.31
Exercised (in dollars per share)				16.31
Forfeited (in dollars per share)				299.89
Expired (in dollars per share)				0.00
Outstanding at the end of the period (in dollars per share)				61.53
Options exercisable at the end of the period (in dollars per share)				$ 25.03
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period				5 years 5 months
Options exercisable at the end of the period				4 years 7 months 22 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period				$ 163,927,000
Options exercisable at the end of the period				$ 158,473,000
Stock options, Grant Date Fair Value Valuation
Expected dividend rate				0.00%
Expected volatility, minimum				50.00%
Expected volatility, maximum				53.00%
Risk-free interest rate, minimum				2.33%
Risk-free interest rate, maximum				2.90%
Expected dividends				$ 0
Employee stock option 2
Stock options, Shares
Outstanding at the beginning of the period (in shares)				37,877
Granted (in shares)				0
Exercised (in shares)				0
Forfeited (in shares)				0
Expired (in shares)				0
Outstanding at the end of the period (in shares)				37,877
Options exercisable at the end of the period (in shares)				0
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 308.90
Granted (in dollars per share)				0.00
Exercised (in dollars per share)				0.00
Forfeited (in dollars per share)				0.00
Expired (in dollars per share)				0.00
Outstanding at the end of the period (in dollars per share)				308.90
Options exercisable at the end of the period (in dollars per share)				$ 0.00
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period				9 years 2 months 13 days
Options exercisable at the end of the period				0 years
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period				$ 0
Options exercisable at the end of the period				$ 0
Performance options
Stock options, Shares
Outstanding at the beginning of the period (in shares)				402,694
Granted (in shares)	21,982	31,336		44,499
Exercised (in shares)				0
Expired (in shares)				0
Outstanding at the end of the period (in shares)				447,193
Options exercisable at the end of the period (in shares)				0
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 183.80
Granted (in dollars per share)				351.70
Exercised (in dollars per share)				0.00
Forfeited (in dollars per share)				0.00
Expired (in dollars per share)				0.00
Outstanding at the end of the period (in dollars per share)				200.51
Options exercisable at the end of the period (in dollars per share)				$ 0.00
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period				8 years 10 months 15 days
Options exercisable at the end of the period				0 years
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period				$ 18,645,000
Options exercisable at the end of the period				$ 0
Stock options, Grant Date Fair Value Valuation
Grant date fair value				$ 296.80
Expected dividend rate				0.00%
Risk-free interest rate, minimum				2.38%
Risk-free interest rate, maximum				2.81%
Expected dividends				$ 0
Minimum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term				P5Y
Minimum | Employee stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value
Minimum | Performance options
Stock options, Grant Date Fair Value Valuation
Expected term				P7Y
Maximum
Stock options, Shares
Granted (in shares)	21,982		672,499
Maximum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term				P6Y4M3D
Maximum | Employee stock options
Stock options, Grant Date Fair Value Valuation
Grant date fair value
Maximum | Performance options
Stock options, Grant Date Fair Value Valuation
Expected term				P7Y1M24D
50% over a period of two years from the grant date [Member] | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period				2 years
33% over a period of three years from the grant date [Member] | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period				3 years
25% over a period of four years from the grant date [Member] | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period				4 years
100% over a period of one year from the grant date [Member] | Employee stock options
Stock options, Grant Date Fair Value Valuation
Vesting period				1 year