SHARE-BASED COMPENSATION: Performance Stock Option Unit Activity (Details) $ / shares in Units, $ in Thousands		6 Months Ended
Jun. 29, 2016 USD ($) item shares	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Number of shares
Outstanding at beginning of the period (in shares) \| shares		3,604,102
Outstanding at end of the period (in shares) \| shares		3,058,089
Exercisable at the end of the period (in shares) \| shares		2,353,864
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		14.60
Exercisable at the end of the period (in dollars per share) \| $ / shares		$ 14.49
Weighted-average remaining contractual term
Outstanding at the end of the period		5 years 4 months 24 days
Exercisable at the end of the period		4 years 7 months 6 days
Aggregate intrinsic value
Outstanding at the end of the period		$ 36,961
Exercisable at the end of the period		28,685
Stock Appreciation Right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares granted	$ 4,900
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
Share-based compensation expense		300
Future expense for performance stock option units		$ 4,600
Number of shares
Granted (in shares) \| shares	633,604	633,604
Outstanding at end of the period (in shares) \| shares		633,604
Weighted-average exercise price per share
Granted (in dollars per share) \| $ / shares		$ 21.40
Outstanding at the end of the period (in dollars per share) \| $ / shares		$ 21.40
Weighted-average remaining contractual term
Outstanding at the end of the period		1 year 7 months 6 days
Exercisable at the end of the period		0 years
Aggregate intrinsic value
Outstanding at the end of the period		$ 3,326
Stock Appreciation Right \| Tranche one \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Stock Appreciation Right \| Tranche one \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	300.00%

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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