SHARE-BASED COMPENSATION: Performance Stock Option Unit Activity (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Jun. 29, 2016 USD ($) item	Jun. 30, 2016 USD ($) $ / shares shares
Number of shares
Outstanding at beginning of the period (in shares) | shares		3,604,102
Outstanding at end of the period (in shares) | shares		3,417,029
Exercisable at the end of the period (in shares) | shares		2,645,523
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 14.52
Outstanding at the end of the period (in dollars per share) | $ / shares		14.78
Exercisable at the end of the period (in dollars per share) | $ / shares		$ 15.03
Weighted-average remaining contractual term
Outstanding at the end of the period		5 years 1 month 6 days
Exercisable at the end of the period		4 years 3 months 18 days
Aggregate intrinsic value
Outstanding at the end of the period | $		$ 25,363
Exercisable at the end of the period | $		19,033
Performance Stock Option Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares granted | $	$ 4,800
Number of separate increments over 2 years | item	2
Percentage of increment over two years	50.00%
Number of years for 50% increments	2 years
Future expense for performance stock option units | $		$ 4,800
Number of shares
Granted (in shares) | shares		622,084
Outstanding at end of the period (in shares) | shares		622,084
Weighted-average exercise price per share
Granted (in dollars per share) | $ / shares		$ 21.32
Outstanding at the end of the period (in dollars per share) | $ / shares		$ 21.32
Weighted-average remaining contractual term
Outstanding at the end of the period		2 years 10 months 24 days
Aggregate intrinsic value
Outstanding at the end of the period | $		$ 417
Performance Stock Option Unit | Tranche one | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Performance Stock Option Unit | Tranche one | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	300.00%