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Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Retirement Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,453	$ 10,115	$ 37,561	$ 30,361
Interest cost	12,885	12,547	38,783	37,141
Expected return on plan assets	(19,546)	(16,285)	(58,532)	(48,890)
Recognized actuarial losses	8,048	3,873	25,142	10,386
Total expense	12,840	10,250	42,954	28,998
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	(215)	149	1,172	1,048
Interest cost	533	863	2,275	2,251
Amortization of prior service cost		1		2
Recognized actuarial losses	211	1,000	2,969	1,609
Total expense	$ 529	$ 2,013	$ 6,416	$ 4,910

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- Definition

Defined Benefit Plan, Service Cost (Credit)

+ References

No definition available.

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Gain or Loss



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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.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Expected Return on Plan Assets



-URI http://asc.fasb.org/extlink&oid=6512171



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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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