Fair Value Measurements (Details) - USD ($)	3 Months Ended
	Apr. 30, 2016	May. 02, 2015	Jan. 30, 2016
Assets:
Cash and equivalents	$ 59,462,000	$ 206,868,000	$ 32,495,000
Short-term investments(a)	97,612,000	128,705,000	226,027,000
Available-for-sale Securities, Noncurrent	80,456,000	120,724,000	71,953,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	7,250,000	0	6,000,000
Notes Receivable, Fair Value Disclosure	43,198,000	46,686,000	33,311,000
Total assets	287,978,000	502,983,000	369,786,000
Cost Method Investments	1,250,000		6,000,000
Business Combination, Contingent Consideration, Liability	56,000,000	0
Other Liabilities, Fair Value Disclosure	262,000	5,231,000	561,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	57,707,000	5,231,000	561,000
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Impairment of Long-Lived Assets Held-for-use	0	418,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	1,445,000	0
Commitments and Contingencies	57,445,000	0	0
Level 1 [Member]
Assets:
Cash and equivalents	59,462,000	206,868,000	32,495,000
Short-term investments(a)	5,676,000	0	2,127,000
Available-for-sale Securities, Noncurrent	286,000	0	181,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	0	0	0
Notes Receivable, Fair Value Disclosure	0	0	0
Total assets	65,424,000	206,868,000	34,803,000
Other Liabilities, Fair Value Disclosure	0	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0	0
Level 2 [Member]
Assets:
Cash and equivalents	0	0	0
Short-term investments(a)	91,936,000	128,705,000	223,900,000
Available-for-sale Securities, Noncurrent	80,170,000	120,724,000	71,772,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	0	0	0
Notes Receivable, Fair Value Disclosure	43,198,000	46,686,000	33,311,000
Total assets	215,304,000	296,115,000	328,983,000
Other Liabilities, Fair Value Disclosure	262,000	5,231,000	561,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	262,000	$ 5,231,000	561,000
Fair Value, Inputs, Level 3 [Member]
Assets:
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	7,250,000		6,000,000
Total assets	7,250,000		$ 6,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	57,445,000
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Commitments and Contingencies	$ 57,445,000