Fair Value Measurements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Jul. 30, 2016	Aug. 01, 2015	Apr. 30, 2016	Mar. 04, 2016	Jan. 30, 2016
Assets:
Cash and equivalents	$ 62,324,000	$ 151,007,000	$ 62,324,000	$ 151,007,000			$ 32,495,000
Short-term investments(a)	103,467,000	140,821,000	103,467,000	140,821,000			226,027,000
Available-for-sale Securities, Noncurrent	77,901,000	179,305,000	77,901,000	179,305,000			71,953,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	7,250,000	0	7,250,000	0			6,000,000
Notes Receivable, Fair Value Disclosure	43,640,000	44,627,000	43,640,000	44,627,000			33,311,000
Total assets	294,582,000	515,760,000	294,582,000	515,760,000			369,786,000
Cost Method Investments	1,250,000		1,250,000				6,000,000
Business Combination, Contingent Consideration, Liability		0		0	$ 56,000,000	$ 56,000,000
Other Liabilities, Fair Value Disclosure	0	3,380,000	0	3,380,000			561,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	59,611,000	3,380,000	59,611,000	3,380,000			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	2,166,000	0	3,611,000	0
Commitments and Contingencies	59,611,000	0	59,611,000	0			0
Level 1 [Member]
Assets:
Cash and equivalents	62,324,000	151,007,000	62,324,000	151,007,000			32,495,000
Short-term investments(a)	120,000	0	120,000	0			2,127,000
Available-for-sale Securities, Noncurrent	314,000	0	314,000	0			181,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	0	0	0	0			0
Notes Receivable, Fair Value Disclosure	0	0	0	0			0
Total assets	62,758,000	151,007,000	62,758,000	151,007,000			34,803,000
Other Liabilities, Fair Value Disclosure	0	0	0	0			0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0	0	0			0
Level 2 [Member]
Assets:
Cash and equivalents	0	0	0	0			0
Short-term investments(a)	103,347,000	140,821,000	103,347,000	140,821,000			223,900,000
Available-for-sale Securities, Noncurrent	77,587,000	179,305,000	77,587,000	179,305,000			71,772,000
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	0	0	0	0			0
Notes Receivable, Fair Value Disclosure	43,640,000	44,627,000	43,640,000	44,627,000			33,311,000
Total assets	224,574,000	364,753,000	224,574,000	364,753,000			328,983,000
Other Liabilities, Fair Value Disclosure	0	3,380,000	0	3,380,000			561,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	$ 3,380,000	0	$ 3,380,000			561,000
Fair Value, Inputs, Level 3 [Member]
Assets:
Cost-method Investments, Aggregate Carrying Amount, Not Evaluated for Impairment	7,250,000		7,250,000				6,000,000
Total assets	7,250,000		7,250,000				$ 6,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure	59,611,000		59,611,000
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Commitments and Contingencies	$ 59,611,000		$ 59,611,000